Disable Rust + clangcl.

run_project_tests.py

@@ -1010,6 +1010,9 @@ def has_broken_compiler_combination() -> bool:
     # Rust and vs2017 do not work together. But only with 32 bits.
     if os.environ['VisualStudioVersion'] == '15.0' and os.environ['Platform'] == 'x86':
         return True
+    # Clang-cl also fails with Rust.
+    if shutil.which('cl') is None and shutil.which('clang-cl'):
+        return True
     return False
 
 def should_skip_rust(backend: Backend) -> bool: