Fix build workflow: remove non-existent lib/ from tar archive

The ninja install targets only install binaries to bin/, not libraries to
lib/. LLVM libraries are statically linked into the clang/clangd binaries,
so only bin/ needs to be packaged.

Author: cs01

.github/workflows/build-clang.yml

@@ -58,7 +58,7 @@ jobs:
       - name: Package binaries
         run: |
           cd install
-          tar -czf clang-nullsafe-linux-x86_64.tar.gz bin/ lib/
+          tar -czf clang-nullsafe-linux-x86_64.tar.gz bin/
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
@@ -150,7 +150,7 @@ jobs:
       - name: Package binaries
         run: |
           cd install
-          tar -czf clang-nullsafe-macos-universal.tar.gz bin/ lib/
+          tar -czf clang-nullsafe-macos-universal.tar.gz bin/
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
@@ -230,7 +230,7 @@ jobs:
       - name: Package binaries
         run: |
           cd install
-          tar -czf clang-nullsafe-windows-x86_64.tar.gz bin/ lib/
+          tar -czf clang-nullsafe-windows-x86_64.tar.gz bin/
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4