The committer name, email and date needs to match the author's
otherwise on every build, seabios will have a different commit
hash for HEAD, which can be problematic for reproducable builds
but also could confuse people if every time they type 'make', they
get a different hash of their rom

Change-Id: Ic4f2095173d9a58c5df335c500c8ce6578d236ec
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>