Add support for Mac OS

[programmingkidx]

Please add support for Mac OS. The makefile indicates coremark does not support Darwin (Mac OS's core).

When I ran 'make' I saw these errors:

$ make
objc[2382]: Class AppleTypeCRetimerRestoreInfoHelper is implemented in both /usr/lib/libauthinstall.dylib (0x202865eb0) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x1082784f8). One of the two will be used. Which one is undefined.
objc[2382]: Class AppleTypeCRetimerFirmwareAggregateRequestCreator is implemented in both /usr/lib/libauthinstall.dylib (0x202865f00) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x108278548). One of the two will be used. Which one is undefined.
objc[2382]: Class AppleTypeCRetimerFirmwareRequestCreator is implemented in both /usr/lib/libauthinstall.dylib (0x202865f50) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x108278598). One of the two will be used. Which one is undefined.
objc[2382]: Class ATCRTRestoreInfoFTABFile is implemented in both /usr/lib/libauthinstall.dylib (0x202865fa0) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x1082785e8). One of the two will be used. Which one is undefined.
objc[2382]: Class AppleTypeCRetimerFirmwareCopier is implemented in both /usr/lib/libauthinstall.dylib (0x202865ff0) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x108278638). One of the two will be used. Which one is undefined.
objc[2382]: Class ATCRTRestoreInfoFTABSubfile is implemented in both /usr/lib/libauthinstall.dylib (0x202866040) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x108278688). One of the two will be used. Which one is undefined.
Makefile:45: *** PLEASE define PORT_DIR! (e.g. make PORT_DIR=simple). Stop.