chore: Specify libclang path in GitHub action

Suggested as a fix in this issue:
rust-lang/rust-bindgen#1797

Author: maael

.github/workflows/release.yml

@@ -33,6 +33,8 @@ jobs:
           version: "10.0"
           directory: ${{ runner.temp }}/llvm
           cached: ${{ steps.cache-llvm.outputs.cache-hit }}
+      - name: Set LIBCLANG_PATH
+        run: echo "LIBCLANG_PATH=$((gcm clang).source -replace "clang.exe")" >> $env:GITHUB_ENV
       - name: Run cargo build
         uses: actions-rs/cargo@v1
         with: