Sanitizer test regressions with CLANG_CONFIG_FILE_SYSTEM_DIR building with GCC after #60394 fix

[xry111]

The fix for #60394 has made setting CLANG_NO_DEFAULT_CONFIG=1 only when the build compiler supports --no-default-config, but when we build LLVM suite with GCC, the build compiler obviously does not support this option. Thus when clang is configured with CLANG_CONFIG_FILE_SYSTEM_DIR and the config file contains some compiler options, some tests start to fail:

Failed Tests (2):
  DataFlowSanitizer-x86_64 :: custom.cpp
  DataFlowSanitizer-x86_64 :: origin_unaligned_memtrans.c