git.sh: Re-implement redundant git downloads

And this time it works.

I'm now calling xbmkget() which in turn calls tmpclone(),
instead of me calling tmpclone() directly.

The git-pull is done on both remotes, regardless of whether
the first succeeds. This way, if I forgot to update a mirror,
downloads would probably still work.

This also fixes an issue people were having, for example where
the gnulib repository of GRUB was always being downloaded
every time.

I'm using a new directory, XBMK_CACHE/clone, instead
of XBMK_CACHE/repo (which I used before), in case people
still have the old caches from before.

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

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