Fixed: objc_msgSend() must be cast with its prototype. (for 64bit arch)

For more details:
https://developer.apple.com/library/ios/documentation/General/Conceptual
/CocoaTouch64BitGuide/ConvertingYourAppto64-Bit/ConvertingYourAppto64-Bi
t.html#//apple_ref/doc/uid/TP40013501-CH3-SW26
Compiled for 64 bit arch