http://bugs.winehq.org/show_bug.cgi?id=33125
--- Comment #42 from Alexandre Julliard julliard@winehq.org 2013-03-09 08:51:52 CST --- You can't change it on Mac OS, it will crash and burn.
If you want to try to track it down (on Linux) you should compile individual dlls with the patch reverted until you find the one that makes a difference. Then repeat for individual files in that dll, and finally function by function in that file to find the offending code.