[libcxx] [llvm] [libc++] Make CC and CXX environment variables mandatory in run-buildbot (PR #166875)

[Nikolas Klauser via llvm-commits]

================
@@ -690,14 +725,6 @@ mingw-static)
           -DLIBUNWIND_ENABLE_SHARED=OFF
     check-runtimes
 ;;
-mingw-dll-i686)
-    clean
-    generate-cmake \
-          -DCMAKE_C_COMPILER=i686-w64-mingw32-clang \
-          -DCMAKE_CXX_COMPILER=i686-w64-mingw32-clang++ \
-          -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake"
-    check-runtimes
-;;
----------------
philnik777 wrote:

It's very nice that we're reducing the number of configurations here.

https://github.com/llvm/llvm-project/pull/166875