Remove unnecessary musl builds for static libraries

Static libraries (.a files) are just archives of object files with
unresolved libc symbols. Those symbols get resolved when the final
executable is linked, using whatever libc is available on the target
system (glibc or musl). Therefore, separate musl builds are not needed.

Changes:
- Removed build-linux-musl and build-linux-aarch64-musl jobs
- Removed LDFLAGS="-static" from Linux builds (incorrect for libraries)
- Simplified to 4 platform builds:
  * x86_64/Linux
  * aarch64/Linux
  * x86_64/Darwin
  * arm64/Darwin

The resulting static libraries will work on both glibc and musl systems
since libc symbols are resolved at final link time, not library build time.

Author: Claude

.github/workflows/build.yml

@@ -5,15 +5,15 @@ on:
   pull_request:
 
 jobs:
-  build-linux:
+  build-linux-x86_64:
     runs-on: ubuntu-latest
     timeout-minutes: 90
     env:
       OS_NAME: Linux
       ARCH_NAME: x86_64
       LIB_NAME: libasyncprocess.a
-      RESULT_NAME: result-linux
-      RESULT_PATH: result-linux
+      RESULT_NAME: result-linux-x86_64
+      RESULT_PATH: result-linux-x86_64
       RESULT_PATH_SUB: result-async/static
     steps:
     - uses: actions/checkout@v4
@@ -30,8 +30,8 @@ jobs:
         autoheader
         automake --add-missing --copy --foreign
         autoconf
-        # Configure for static build
-        ./configure --enable-static --disable-shared LDFLAGS="-static"
+        # Configure for static library build
+        ./configure --enable-static --disable-shared
         make
     - name: Verify static library
       run: |
@@ -49,53 +49,6 @@ jobs:
         name: ${{ env.RESULT_NAME }}
         path: ${{ env.RESULT_PATH }}
 
-  build-linux-musl:
-    runs-on: ubuntu-latest
-    timeout-minutes: 90
-    env:
-      OS_NAME: Linux-musl
-      ARCH_NAME: x86_64
-      LIB_NAME: libasyncprocess.a
-      RESULT_NAME: result-linux-musl
-      RESULT_PATH: result-linux-musl
-      RESULT_PATH_SUB: result-async/static
-    steps:
-    - uses: actions/checkout@v4
-    - name: Build on Alpine Linux (musl)
-      uses: uraimo/run-on-arch-action@v2
-      with:
-        arch: x86_64
-        distro: alpine_latest
-        run: |
-          apk add --no-cache build-base automake autoconf libtool
-          pwd
-          uname
-          uname -m
-          gcc -v
-          # Generate build system
-          libtoolize --copy --force --quiet
-          aclocal
-          autoheader
-          automake --add-missing --copy --foreign
-          autoconf
-          # Configure for static build
-          ./configure --enable-static --disable-shared LDFLAGS="-static"
-          make
-          # Verify static library
-          file .libs/libasyncprocess.a
-          ls -lh .libs/libasyncprocess.a
-    - name: Copy Result
-      if: always()
-      run: |
-        mkdir -p $RESULT_PATH/$RESULT_PATH_SUB/$ARCH_NAME/$OS_NAME
-        cp .libs/$LIB_NAME $RESULT_PATH/$RESULT_PATH_SUB/$ARCH_NAME/$OS_NAME/
-    - name: Upload Result
-      if: always()
-      uses: actions/upload-artifact@v4
-      with:
-        name: ${{ env.RESULT_NAME }}
-        path: ${{ env.RESULT_PATH }}
-
   build-linux-aarch64:
     runs-on: ubuntu-latest
     timeout-minutes: 90
@@ -109,63 +62,13 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Build on aarch64 (arm64)
-      id: runcmd
       uses: uraimo/run-on-arch-action@v2
       with:
         arch: aarch64
         distro: ubuntu22.04
         run: |
           apt-get update
-          apt-get -y install build-essential
-          apt-get -y install automake
-          apt-get -y install libtool
-          pwd
-          uname
-          uname -m
-          gcc -v
-          # Generate build system
-          libtoolize --copy --force --quiet
-          aclocal
-          autoheader
-          automake --add-missing --copy --foreign
-          autoconf
-          # Configure for static build
-          ./configure --enable-static --disable-shared LDFLAGS="-static"
-          make
-          # Verify static library
-          file .libs/libasyncprocess.a
-          ls -lh .libs/libasyncprocess.a
-    - name: Copy Result
-      if: always()
-      run: |
-        mkdir -p $RESULT_PATH/$RESULT_PATH_SUB/$ARCH_NAME/$OS_NAME
-        cp .libs/$LIB_NAME $RESULT_PATH/$RESULT_PATH_SUB/$ARCH_NAME/$OS_NAME/
-    - name: Upload Result
-      if: always()
-      uses: actions/upload-artifact@v4
-      with:
-        name: ${{ env.RESULT_NAME }}
-        path: ${{ env.RESULT_PATH }}
-
-  build-linux-aarch64-musl:
-    runs-on: ubuntu-latest
-    timeout-minutes: 90
-    env:
-      OS_NAME: Linux-musl
-      ARCH_NAME: aarch64
-      LIB_NAME: libasyncprocess.a
-      RESULT_NAME: result-linux-aarch64-musl
-      RESULT_PATH: result-linux-aarch64-musl
-      RESULT_PATH_SUB: result-async/static
-    steps:
-    - uses: actions/checkout@v4
-    - name: Build on aarch64 Alpine (musl)
-      uses: uraimo/run-on-arch-action@v2
-      with:
-        arch: aarch64
-        distro: alpine_latest
-        run: |
-          apk add --no-cache build-base automake autoconf libtool
+          apt-get -y install build-essential automake libtool
           pwd
           uname
           uname -m
@@ -176,8 +79,8 @@ jobs:
           autoheader
           automake --add-missing --copy --foreign
           autoconf
-          # Configure for static build
-          ./configure --enable-static --disable-shared LDFLAGS="-static"
+          # Configure for static library build
+          ./configure --enable-static --disable-shared
           make
           # Verify static library
           file .libs/libasyncprocess.a
@@ -219,7 +122,7 @@ jobs:
         autoheader
         automake --add-missing --copy --foreign
         autoconf
-        # Configure for static build
+        # Configure for static library build
         ./configure --enable-static --disable-shared
         make
     - name: Verify static library
@@ -264,7 +167,7 @@ jobs:
         autoheader
         automake --add-missing --copy --foreign
         autoconf
-        # Configure for static build
+        # Configure for static library build
         ./configure --enable-static --disable-shared
         make
     - name: Verify static library
@@ -286,7 +189,7 @@ jobs:
 
   release:
     runs-on: ubuntu-latest
-    needs: [build-linux, build-linux-musl, build-linux-aarch64, build-linux-aarch64-musl, build-osx-arm64, build-osx-x86_64]
+    needs: [build-linux-x86_64, build-linux-aarch64, build-osx-arm64, build-osx-x86_64]
     if: startsWith(github.ref, 'refs/tags/')
     steps:
     - name: Download all artifacts