http://bugs.winehq.org/show_bug.cgi?id=59079
--- Comment #3 from actium@gmx.net --- I agree that depending on backports is a hard no. However, I was thinking of cherry picking *only* the newer version of ntsync.h into the package source files to substitute Trixie's "old" version. While somewhat unclean, it would not pull in any backports dependencies. Dunno whether that's even possible with OBS. I have no packaging experience.
I understand this may be a too unconventional suggestion. Doing this merely in an effort to solve this upstream before I pursue a workaround.