Compile libgsm with MS-GSM support

This is needed so we can write a decoder for MagicJack voicemail files.
b/6620569

Change-Id: Ib8fd8e57492e49232ef7824a811043d417701eba
Merge tag 'android-4.3_r2.1' into jellybean-mr2.1

Android 4.3 release 2.1