[spotify/rtp] Remove some unused functions

Closes #1705

src/inputs/spotify.c

@@ -71,17 +71,6 @@ spotify_deinit(void)
   backend->deinit();
 }
 
-int
-spotify_login(const char *username, const char *password, const char **errmsg)
-{
-  struct spotify_backend *backend = backend_set();
-
-  if (!backend || !backend->login)
-    return -1;
-
-  return backend->login(username, password, errmsg);
-}
-
 int
 spotify_login_token(const char *username, const char *token, const char **errmsg)
 {

src/inputs/spotify.h

@@ -30,9 +30,6 @@ spotify_init(void);
 void
 spotify_deinit(void);
 
-int
-spotify_login(const char *username, const char *password, const char **errmsg);
-
 int
 spotify_login_token(const char *username, const char *token, const char **errmsg);
 

src/outputs/rtp_common.c

@@ -54,15 +54,16 @@ timespec_to_ntp(struct timespec *ts, struct ntp_timestamp *ns)
   ns->frac = (uint32_t)((double)ts->tv_nsec * 1e-9 * FRAC);
 }
 
+/*
 static inline void
 ntp_to_timespec(struct ntp_timestamp *ns, struct timespec *ts)
 {
-  /* Seconds since Unix Epoch (1970-01-01) */
+  // Seconds since Unix Epoch (1970-01-01)
   ts->tv_sec = ns->sec - NTP_EPOCH_DELTA;
 
   ts->tv_nsec = (long)((double)ns->frac / (1e-9 * FRAC));
 }
-
+*/
 struct rtp_session *
 rtp_session_new(struct media_quality *quality, int pktbuf_size, int sync_each_nsamples)
 {