[Bug 35815] Allow remapping of joystick buttons

https://bugs.winehq.org/show_bug.cgi?id=35815

--- Comment #14 from Sophira  ---
Hi Andrew,

I see your patch is in wine-staging - I came across it while applying the
workarounds that the FFXIV community have devised for the new launcher failing
to correctly render (see bug 47069). (Also, hi, I'm the poster of the Reddit
thread!)

How do I use this new patch? Will the previous ButtonMap value that I posted
for the DS4 continue to work with this patch, or do I need to change it?