refactor: Remove llvm toolchain selection

Author: FrozenLemonTee

.github/workflows/ci.yml

@@ -105,7 +105,7 @@ jobs:
         shell: bash
         run: |
           set -euxo pipefail
-          xmake f -m release --toolchain=llvm -vv -y
+          xmake f -m release  -vv -y
           xmake -y -vv -j"$(sysctl -n hw.ncpu)"
 
   build-windows: