.gitcheck: must stricter error handling

we also run it in releases, so to compensate:
it now checks for .git/, but only in project
directories, not the main lbmk directory of
the git repository or a release.

this is because in a release, it's possible
that the user may still delete coreboot/
directories and re-download coreboot trees

this is not intended, but we must not assume
that users use libreboot the way it's intended!

"much stricter" because there was previously
none, intentionally, due to the above fact. the
checking of .git/ should mitigate this (the
script will exit with zero status if it isn't
there)

Signed-off-by: Leah Rowe <leah@libreboot.org>

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