Remove -Wshorten-64-to-32 FreeBSD on aarch64 as it breaks compilation. (#9010)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9010

Reviewed By: pdillinger

Differential Revision: D31613434

Pulled By: ajkr

fbshipit-source-id: 305a84fa715d0121fa65abaea3d32bad41233957

build_tools/build_detect_platform

@@ -606,8 +606,8 @@ EOF
 fi
 
 # TODO(tec): Fix -Wshorten-64-to-32 errors on FreeBSD and enable the warning.
-# -Wshorten-64-to-32 breaks compilation on FreeBSD i386
-if ! [ "$TARGET_OS" = FreeBSD -a "$TARGET_ARCHITECTURE" = i386 ]; then
+# -Wshorten-64-to-32 breaks compilation on FreeBSD aarch64 and i386
+if ! { [ "$TARGET_OS" = FreeBSD ] && [ "$TARGET_ARCHITECTURE" = arm64 -o "$TARGET_ARCHITECTURE" = i386 ]; }; then
   # Test whether -Wshorten-64-to-32 is available
   $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null -Wshorten-64-to-32 2>/dev/null  <<EOF
     int main() {}