Add opencore-amr 0.1.3 from http://sourceforge.net/projects/opencore-amr/files/opencore-amr/

Credit to http://sourceforge.net/projects/opencore-amr/
add build_iphone.sh for Xcode 4.5+, supports i386, armv7, armv7s
rename to build_ios.sh

should work with vanilla clone.
Merge commit 'f5deb3d16087a89bce43ea7663e1aeec88953a74'
Merge commit '473374b59136c2f9523ff9d8f069ba0963455e2d'