[ios/libmpeg2] - fix compilation of libmpeg2 when using xcode 5.1.1 (this motion_compensation asm can't be compiled with the current clang in a pic way - needs someone with arm asm foo)
[atv2] - remove unused include (which also fails ond ios 7.1 sdk)
[ios/atv2] - update readme to reflect support for Xcode5.1.1 and iOS SDK 7.1