CI: Use default compiler on runner instead of clang

Author: ekilmer

.github/workflows/main.yml

@@ -100,8 +100,6 @@ jobs:
         cmake \
           -S . \
           -B build \
-          -DCMAKE_C_COMPILER=clang \
-          -DCMAKE_CXX_COMPILER=clang++ \
           -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
           -DCMAKE_C_COMPILER_LAUNCHER=ccache \
           -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \