It is just a temporary hack, but it lets you start Grand Theft Auto 5 without the annoying ALT+Enter workaround. I guess this patch as it is will not make it into Wine/Wine-staging as it is a hack, but the problem has been traced and will hopefully be fixed soon!
Patch Link: Thank you Piotr W!
https://bugs.winehq.org/show_bug.cgi?id=42330#c54
Compiling on Ubuntu:
Compiling on Arch* based systems:
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