parse-opt: migrate git-merge-base.
parse-opt: migrate git-merge-base.

Signed-off-by: Pierre Habouzit <e35372408142b0126e39efe890308b64d6f401f6@debian.org>
Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git