Convert ui tests that need specific `tests/ui/.gitattributes` entries into run-make tests

[jieyouxu]

Currently:

rust/tests/ui/.gitattributes

Lines 1 to 5 in 2ef7858

	lexer-crlf-line-endings-string-literal-doc-comment.rs -text
	json-bom-plus-crlf.rs -text
	json-bom-plus-crlf-multifile.rs -text
	json-bom-plus-crlf-multifile-aux.rs -text
	trailing-carriage-return-in-string.rs -text

EDIT: they have weird line endings / BOM markers that make them hard to edit / change.

[Noratrieb]

Couldn't they just be UI tests in a subdirectory?

[jieyouxu]

Couldn't they just be UI tests in a subdirectory?

Sorry, I dunno why I wrote "enforced via .gitattributes" -- it's moreso that the tests themselves are hard to edit -- they have specific line endings / mixed line endings and/or BOM markers that make the tests very hard to change. Moving them to some subdirectory doesn't make them easier to edit.

[Noratrieb]

Ah yeah. Making them string literals in a run-make test would help.