winemac.drv: Use C99 bool instead of int for Boolean values.

This largely applies to the variables and functions declared in macdrv_cocoa.h, which (currently) cannot use Win32 types.

Note that for ObjC method signatures, I'm following the advice of Google's Objective-C Style Guide and sticking with ObjC BOOL in method signatures (like - (void) setRetinaMode:(BOOL)mode). I think the motivation behind that is to avoid confusion between BOOL and bool when overriding methods: on some architectures (ARM64) they're the same, on others (Intel) they aren't, so just stick with ObjC BOOL everywhere.

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