frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.

/*
 * We implement a couple of helper functions on top of the WAV reader
 * which we've lifted out of opencore-amrnb test code; this header file
 * provides prototype declarations for these functions.
 */

extern int wavrd_check_header(void *wav, const char *filename);
extern int wavrd_get_pcm_block(void *wav, int16_t *pcmbuf);