t0012: verify that built-ins handle `-h` even without gitdir

We just fixed a class of recently introduced bugs where calling, say,
`git fetch -h` outside a repository would not show the usage but instead
show an ugly `BUG` message.

Let's verify that this does not regress anymore.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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