[GreenDragon] Don't build runtime for sanitizer bots

libcxx currently has an incompatible ABI with macOS system libcxx. This
causes test failures due to mismatching ABI.

Author: cachemeifyoucan

zorg/jenkins/jobs/jobs/clang-stage2-cmake-RgSan

@@ -101,7 +101,6 @@ pipeline {
                        python llvm-zorg/zorg/jenkins/monorepo_build.py cmake build \
                            --cmake-type=RelWithDebInfo \
                            --projects="clang;clang-tools-extra" \
-                           --runtimes="libcxx;libcxxabi;libunwind" \
                            --cmake-flag='-DLLVM_USE_SANITIZER=Address;Undefined' \
                            --cmake-flag="-DLIBCXX_INCLUDE_TESTS=OFF" \
                            --timeout=1800 \