[ios/depends] - remove -no-integrated-as from xcode5 cflags - fixes compile of most of depends for xcode5.1 (clang 503.0.40) - see http://llvm.org/bugs/show_bug.cgi?id=17240
[ios/depends/ffi] - libffi needs -no-integrated-as - see https://github.com/atgreen/libffi/issues/50
[osx/ios/depends] - expose the xcode version to depends makefiles
[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
Merge pull request #4958 from Memphiz/iosxcode51

[ios] - support XCode 5.1.1 with iOS SDK 7.1