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.

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

extern void write_pcm_to_robe(FILE *outf, const int16_t *pcm);