all: bare metal support (fix -freestanding) (#9624)

cmd/tools/vtest-cleancode.v

@@ -35,6 +35,7 @@ const (
 		'vlib/v/tests/generics_test.v', /* multi_generic_args<Foo<int>, Foo<int> >(...) becomes .... Foo<int>>(...) which does not parse */
 		'vlib/v/tests/string_interpolation_test.v' /* TODO byteptr: &byte.str() behaves differently than byteptr.str() */,
 		'vlib/v/gen/js/tests/js.v', /* local `hello` fn, gets replaced with module `hello` aliased as `hl` */
+		'vlib/v/gen/c/cheaders.v' /* the preprocessor directives are formated to the V standard, even though they are in a string literal */,
 	]
 	vfmt_verify_list                = [
 		'cmd/',