build(tiledit): use clang for the CI build

.github/workflows/sirc-tiledit.yml

@@ -37,11 +37,14 @@ jobs:
         run: sudo apt-get install clang-format clang-tidy
       - name: Install python based dependencies
         run: python -m pip install meson==${{ matrix.meson_version }} ninja
+      - name: Set up Clang
+        uses: egor-tensin/setup-clang@v1
       - name: Configure Project
         run: >
           meson setup build/
         env:
-          CC: gcc
+          CC: clang
+          CXX: clang++
       - name: Compile Project
         run: |
           cd build