[Bug 43328] dotnet 4.5 applications crash in factory_get_cached_fontface

https://bugs.winehq.org/show_bug.cgi?id=43328

--- Comment #8 from Anton Romanov  ---
(In reply to Alistair Leslie-Hughes from comment #7)
> Can you please attach the patch? (just so it not lost)

That one is more of a duct tape fix. 
I haven't yet looked closely at that cache implementation and this was just to
verify if race condition is indeed whats causing this. For example this one
does not protect insertion to the cache I think. Once I have time to work on
the proper patch I'll give it a shot and submit it to wine-patches. That is
unless nsivov or someone else beats me to it.