Fix for own mistake in r57555 :-(
Add include to autoexec.c instead of BLI_path_util.h

Thanks Bastien Montagne for the hint.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@57556 954f8c5b-7b00-dc11-b283-0030488c597c