Supply LIBCLANG_PATH for clang-14 for yjit-bindgen

Or else it gets confused from all the different versions of LLVM in the
image.

.github/workflows/yjit-ubuntu.yml

@@ -82,6 +82,7 @@ jobs:
           - test_task: 'yjit-bindgen'
             hint: 'To fix: use patch in logs'
             configure: '--with-gcc=clang-14 --enable-yjit=dev'
+            libclang_path: '/usr/lib/llvm-14/lib/libclang.so.1'
 
           - test_task: 'check'
             # YJIT should be automatically built in release mode on x86-64 Linux with rustc present
@@ -192,6 +193,7 @@ jobs:
           PRECHECK_BUNDLED_GEMS: 'no'
           SYNTAX_SUGGEST_TIMEOUT: '5'
           YJIT_BINDGEN_DIFF_OPTS: '--exit-code'
+          LIBCLANG_PATH: ${{ matrix.libclang_path }}
         continue-on-error: ${{ matrix.continue-on-test_task || false }}
 
       - name: Show ${{ github.event.pull_request.base.ref }} GitHub URL for yjit-bench comparison