[atv2] - added -lxslt to the linker flags in xcode project for atv2 target. Seems atv2 target is the only one who doesn't pick up the xcconfig (maybe because of the include indirection or what - i think its a bug in xcode3). This would have resulted in crash&burn on atv2 at runtime when accessing a function from libxslt (we don't see the issue during compile time because of lazy linking which is needed because of atv2 backrow stuff)
[ios7/ios/atv2] - link statically against libmpeg2 - since ios7 we crash and burn when we load libmpeg2 as dylib - closes #14813