libclang-abi-tests: Fix failure when checking libclang.so

We were assuming that the symbol versions for libclang.so would be different
for each major release, but this is not longer true.  The libclang.so symbol
versions only change when the ABI changes.

Author: tstellar

.github/workflows/libclang-abi-tests.yml

@@ -117,10 +117,12 @@ jobs:
     - name: Dump ABI
       run: |
         parallel abi-dumper -lver ${{ matrix.ref }} -skip-cxx -public-headers ./install/include/${{ needs.abi-dump-setup.outputs.ABI_HEADERS }} -o {}-${{ matrix.ref }}.abi ./build/lib/{} ::: ${{ needs.abi-dump-setup.outputs.ABI_LIBS }}
-        for lib in ${{ needs.abi-dump-setup.outputs.ABI_LIBS }}; do
-          # Remove symbol versioning from dumps, so we can compare across major versions.
-          sed -i 's/LLVM_${{ matrix.llvm_version_major }}/LLVM_NOVERSION/' $lib-${{ matrix.ref }}.abi
-        done
+        # Remove symbol versioning from dumps, so we can compare across major
+        # versions.  We don't need to do this for libclang.so since its ABI
+        # is stable across major releases and the symbol versions don't change.
+        if [ -e libclang-cpp.so-${{ matrix.ref }}.abi ]; then
+          sed -i 's/LLVM_[0-9]\+/LLVM_NOVERSION/' libclang-cpp.so-${{ matrix.ref }}.abi
+        fi
     - name: Upload ABI file
       uses: actions/upload-artifact@v2
       with: