build: use clang over g++ for ubsan

Author: H4ad

.github/workflows/test-ubsan.yml

@@ -40,9 +40,9 @@ jobs:
     if: github.event.pull_request.draft == false
     runs-on: ubuntu-20.04
     env:
-      CC: gcc
-      CXX: g++
-      LINK: g++
+      CC: clang
+      CXX: clang++
+      LINK: clang++
       CONFIG_FLAGS: --enable-ubsan
     steps:
       - uses: actions/checkout@v3