Update release build script

Default binaries are now compiled for haswell or higher
because using FMA instructions results in a noticeable performance gain.

Author: kageru

build_release.sh

@@ -1,10 +1,13 @@
 #!/bin/sh
 
-# set rustflags as empty to make sure we’re not building for march=native,
-# as these are public release builds
-RUSTFLAGS="" cargo build --release --locked
+# Set rustflags as empty to build for legacy hosts.
+# I only build this for windows because Linux users on old machines can just compile their own binary
 RUSTFLAGS="" cargo build --release --target=x86_64-pc-windows-gnu --locked
-mv target/release/libadaptivegrain_rs.so ./
+mv target/x86_64-pc-windows-gnu/release/adaptivegrain_rs.dll ./adaptivegrain_rs-no-fma.dll
+RUSTFLAGS="-C target-cpu=haswell" cargo build --release --locked
+RUSTFLAGS="-C target-cpu=haswell" cargo build --release --target=x86_64-pc-windows-gnu --locked
 mv target/x86_64-pc-windows-gnu/release/adaptivegrain_rs.dll ./
+mv target/release/libadaptivegrain_rs.so ./
 strip libadaptivegrain_rs.so
 strip adaptivegrain_rs.dll
+strip adaptivegrain_rs-no-fma.dll