fix: fix macos arm64 build (#9)

Author: durran

Diff for: .github/workflows/CI.yml

@@ -43,9 +43,15 @@ jobs:
               npm run build -- --target x86_64-unknown-linux-gnu --zig --zig-abi-suffix 2.12 &&
               llvm-strip -x *.node
           - host: macos-latest
+            architecture: x64
             target: aarch64-apple-darwin
             build: |
-              npm run build --target=aarch64-apple-darwin
+              sudo rm -Rf /Library/Developer/CommandLineTools/SDKs/*;
+              export CC=$(xcrun -f clang);
+              export CXX=$(xcrun -f clang++);
+              SYSROOT=$(xcrun --sdk macosx --show-sdk-path);
+              export CFLAGS="-isysroot $SYSROOT -isystem $SYSROOT";
+              npm run build -- --target aarch64-apple-darwin
               strip -x *.node
           - host: ubuntu-latest
             architecture: x64