Install libclang for monero_c consistency

.gitea/workflows/consistency.yml

@@ -45,6 +45,11 @@ jobs:
           fetch-depth: 1
           submodules: false
 
+      - name: Install libclang for ffigen
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y clang libclang-14-dev llvm-14
+
       - name: Setup Flutter
         uses: https://github.com/subosito/flutter-action@v2
         with:
@@ -56,6 +61,8 @@ jobs:
           dart pub get
 
       - name: Regenerate Dart bindings
+        env:
+          LIBCLANG_PATH: /usr/lib/llvm-14/lib
         run: |
           cd impls/monero.dart
           ./update_bindings.sh