patches: added Vanguard Saga of Heroes fix

[loisgomez]

Context:
Vanguard Saga of Heroes is an MMORPG that was closed years ago by SOE.
The game is still alive in the emulator scene at https://vgoemulator.net/

The game seem to have relied on an old behaviour of the function SetCurrentDirectoryW( LPCWSTR dir )
which currently crashes the game.

This patch was a solution discovered by the community at https://vgoemulator.net/phpBB3/viewtopic.php?t=5563

Summary of changes:

• Updates the function SetCurrentDirectoryW( LPCWSTR dir ) through a patch that removes the trailing ".".
• Previously the game will try to access "bin\.Caches" and crash. It will now access "bin\Caches" and run successfully

Notes:

• This is my first attempt to get this change upstream so the community does not have to rely on a custom build of Proton-GE and we can get the benefits of it being upstream
• I am very unfamiliar with the wine codebase so this might not be the best way to fix the issue
• I am new to the wine ecosystem so please do let me know if there is a better way to get this upstream

I have now submitted the change upstream to wine as well for review:

https://gitlab.winehq.org/wine/wine/-/merge_requests/7023

[GloriousEggroll]

heya thanks for this, it looks ok but I think it could use an envvar barrier at least until its accepted upstream. this way we can add a protonfix for it and it wont affect other games