Updating guilt to allow git 1.8.x as a supported version. This version has
no impact on other functionality within the scripts, so no other adjustments
are necessary.
[YOCTO #3275]
(From OE-Core rev: 18bc7b44ef58cbcbe32d45504d71eed54ef695a4)
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>