Revert "[ios7/ios/atv2] - link statically against libmpeg2 - since ios7 we crash and burn when we load libmpeg2 as dylib - closes #14813"

This reverts commit 0e53fea3bbf092cccad9f5ade492754ee2a22ead.

Conflicts:
	XBMC.xcodeproj/project.pbxproj
[ios] - fix libmpeg2 PIC asm by including upstream patch - this is the real fix for the ios7 crash when loading libmpeg2 (and by reverting the former uncorrect fix this also fixes the kernel panic which occured on atv2 running ios5 and older ...)
Merge pull request #4188 from Memphiz/ios7mpeg2crash2

[ios7/atv2] - the real fix for the crash&burn