ci: remove extra libc++ installation

Author: aminya

.github/workflows/ci.yml

@@ -967,15 +967,6 @@ jobs:
           ninja: true
           kcov: ${{ startsWith(matrix.config.os, 'ubuntu') }}
 
-      - name: Install libc++
-        id: install_libcxx
-        if: matrix.config.libcxx && (steps.cache-libcxx.outputs.cache-hit != 'true')
-        shell: bash
-        working-directory: ${{ env.HOME }}
-        run: |
-          sudo ln -s /usr/include/locale.h /usr/include/xlocale.h
-          $GITHUB_WORKSPACE/install_libcxx.sh
-
       - name: Verify compilation errors
         if: (!startsWith(matrix.config.os, 'windows'))
         shell: bash