emulators/wine-devel: Update to Wine 6.15

This includes the following changes:

• WinSock (WS2_32) library converted to PE.
• Support for performance data in the registry.
• More 32->64-bit thunks for NTDLL calls.
• Improved floating point status handling in the C runtime.
• More preparation work for the GDI syscall interface.
• Various bug fixes.

My patch files/patch-dlls-ntdll-unix-virtual.c has been accepted
upstream in the meantime, so remove it here.