Don't clang-format or clang-tidy subprojects

It's undesirable to try to format or tidy up subprojects for which we
aren't the authority on. Making this change seems to allow one to use
"ninja clang

Don't clang-format or clang-tidy subprojects

It's undesirable to try to format or tidy up subprojects for which we
aren't the authority on. Making this change seems to allow one to use
"ninja clang-format" within a repo, and not have it reformat all the
subprojects. More testing needed, but it's unlikely to hurt things.

Tested:
Ran "ninja clang-format" and observed _only_ the files in the repo get
formatted, not the subproject files.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ifda7dd02b114e404f33c51919a14ca1a2bbd2352

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