Since some month I keep splitting/cleaning up/rebasing the PowerPC64le patchset from last year: [1]
The goal is to have a winelib base for Hangover [2] on PowerPC64 and there's also interest in having winelib for crosscompiling [3].
[1] https://github.com/madscientist159/wine/commits/master [2] https://github.com/AndreRH/hangover [3] https://wiki.raptorcs.com/wiki/Porting/Wine