Fix binary packaging in build workflow

Change tar command to package lib/ instead of lib/clang/ since the
install process creates a versioned directory structure (lib/clang/20/)
rather than lib/clang/ directly. This fixes the "Cannot stat: No such
file or directory" error during packaging.

Author: cs01

.github/workflows/build-clang.yml

@@ -46,7 +46,7 @@ jobs:
       - name: Package binaries
         run: |
           cd install
-          tar -czf clang-nullsafe-linux-x86_64.tar.gz bin/ lib/clang/
+          tar -czf clang-nullsafe-linux-x86_64.tar.gz bin/ lib/
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
@@ -128,7 +128,7 @@ jobs:
       - name: Package binaries
         run: |
           cd install
-          tar -czf clang-nullsafe-macos-universal.tar.gz bin/ lib/clang/
+          tar -czf clang-nullsafe-macos-universal.tar.gz bin/ lib/
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
@@ -198,7 +198,7 @@ jobs:
       - name: Package binaries
         run: |
           cd install
-          tar -czf clang-nullsafe-windows-x86_64.tar.gz bin/ lib/clang/
+          tar -czf clang-nullsafe-windows-x86_64.tar.gz bin/ lib/
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4