libgsmhr1/dec_func.c: rm unused static functions In the original code, sp_dec.c held two kinds of functions: those needed only as part of the decoder, and those used by both decoder and encoder engines. In this library, we have moved the latter class of functions to dec_func.c module. Almost all static functions from the original sp_dec.c, with the exception of aToRc(), are needed only on sp_dec.c side of the new divide - remove them from dec_func.c, where they became dead code.

/*
 * 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);