boringssl build not cxx flags

Author: Gioee

.github/workflows/main.yml

@@ -125,7 +125,6 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release \
             -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE \
             -DBUILD_SHARED_LIBS=OFF \
-            -DCMAKE_CXX_FLAGS="-static-libc++" \
             -DCMAKE_EXE_LINKER_FLAGS="-static" \
             ..
           make