libgsmhr1: update for TW-TS-002 version 1.2.0 The component of libgsmhr1 being changed is RTP input functions; the change is accepting FT=1 (invalid SID) frames both with and without payload data bits.

/*
 * This header file declares the interface to our helper function
 * for reading 16-bit linear PCM samples from a "robe" input file.
 */

extern int robe_get_pcm_block(FILE *inf, int16_t *pcmbuf);