git.el: Set process-environment instead of invoking env
This will make it a little less posix-dependent, and more efficient. Included is also a minor doc improvement. Signed-off-by: NDavid Kågedal <davidk@lysator.liu.se> Acked-by: NAlexandre Julliard <julliard@winehq.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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