http://bugs.winehq.org/show_bug.cgi?id=34812
--- Comment #3 from Nikolay Sivov bunglehead@gmail.com 2013-10-27 10:15:21 CDT --- Now that you know a commit id you can do:
1) reset a tree to a commit just before this bad commit - you already did that while bisecting;
2) revert a commit in current tree without creating a revert commit.
--- git show <commitid> | patch -p1 -R ---
3) edit a source file manually, it's should be easy in this case.