tools: skip file that is not compatible with sanitized=undefined tests during v test-self

[ttytm]

./v -cc clang -cflags -fsanitize=undefined -o v2 cmd/v && ./v2 -cc clang -cflags -fsanitize=undefined vlib/v/compiler_errors_test.v

[spytheman]

Why is this skip needed?

Afaik it works, and can reveal real problems - most of the .vv files, are tested by compiler_errors_test.v .

[spytheman]

#21331 should fix the root cause (cgen for .sort(), called on an empty array).

With it:

[ttytm]

Yep that's the better solution.