Process an incoming Mach message.
Original signature is '- (void)handleMachMessage:(void *)machMessage'
Available in Mac OS X v10.0 and later.


- machMessage (IntPtr)
- A pointer to a Mach message, cast as a pointer to void.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)