build(tiledit): try removing old LLVM first

.github/workflows/sirc-tiledit.yml

@@ -25,6 +25,15 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+
+      - name: Remove old LLVM
+        run: |
+          sudo apt-get purge clang-format clang-tidy clang-tools clang clangd libc++-dev libc++1 libc++abi-dev libc++abi1 libclang-dev libclang1 liblldb-dev libllvm-ocaml-dev libomp-dev libomp5 lld lldb llvm-dev llvm-runtime llvm python3-clang
+      - name: Install up-to-date LLVM
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh 18 all
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
@@ -33,12 +42,6 @@ jobs:
         uses: jurplel/install-qt-action@v4
         with:
           version: 6.6.*
-      - name: Install up-to-date clang
-        run: |
-          wget https://apt.llvm.org/llvm.sh
-          chmod +x llvm.sh
-          sudo ./llvm.sh 18
-          sudo apt-get install clang-format-18 clang-tidy-18
       - name: Install python based dependencies
         run: python -m pip install meson==${{ matrix.meson_version }} ninja
       - name: Configure Project