guilt: update to latest git version

guilt: update to latest git version

Uprev guilt to the latest guilt version from its upstream repository.
As part of the uprev all of the previous changes required for the
yocto kernel tools to use git to manipulate series files have been
dropped. These changes were specific to circumventing parts of guilt's
internal santiy checking to allow specific Yocto kernel manipluation
of sub-series files.

Since the kernel tools no longer need guilt, we can use an up to date
and nearly pure upstream version of guilt.

(From OE-Core rev: 595c4469adc36d88ba2403915fc6c1d355014a58)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>