[PATCH] winemac.drv: fix compile with pre macOS 10.12 SDKs

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=105695

Your paranoid android.


=== debian11 (build log) ===

error: patch failed: dlls/winemac.drv/cocoa_app.h:56
Task: Patch failed to apply

=== debian11 (build log) ===

error: patch failed: dlls/winemac.drv/cocoa_app.h:56
Task: Patch failed to apply