For patches that we have to extract the header information by hand (i.e.
will not apply with "git am"), make the following improvements:
* If we can't extract author/date/subject, then try to do so from the
commit that added the patch in git (assuming the metadata is tracked
by git)
* Take only first Signed-off-by line instead of last
* Accept any case for "Signed-off-by" in case author has typed it by
hand
* Improve conditional - we can skip the other cases if one matches
Implements [YOCTO #7624].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
