stack_size macro conflicts with system defined macro on MacOSX.
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=946
Reported by @grubba
Compiling /home/grubba/src/Pike7.1/src/interpret.c
/System/Library/Frameworks/System.framework/Headers/mach/shared_memory_server.h:45:
warning: could not use precompiled header
'/System/Library/Frameworks/System.framework/Headers/mach/mach.p', because:
/System/Library/Frameworks/System.framework/Headers/mach/shared_memory_server.h:45:
warning: macro 'stack_size' defined by
/home/grubba/src/Pike7.1/src/interpret.h conflicts with precomp