Silence pointless compiler warnings

Author: behackett

bson/time64.c

@@ -543,6 +543,7 @@ struct TM *gmtime64_r (const Time64_T *in_time, struct TM *p)
 
  assert(p != NULL);
 
+#ifdef USE_SYSTEM_GMTIME
  /* Use the system gmtime() if time_t is small enough */
  if( SHOULD_USE_SYSTEM_GMTIME(*in_time) ) {
  time_t safe_time = (time_t)*in_time;
@@ -554,6 +555,7 @@ struct TM *gmtime64_r (const Time64_T *in_time, struct TM *p)
 
  return p;
  }
+#endif
 
 #ifdef HAS_TM_TM_GMTOFF
  p->tm_gmtoff = 0;
@@ -668,6 +670,7 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
 
  assert(local_tm != NULL);
 
+#ifdef USE_SYSTEM_LOCALTIME
  /* Use the system localtime() if time_t is small enough */
  if( SHOULD_USE_SYSTEM_LOCALTIME(*time) ) {
  safe_time = (time_t)*time;
@@ -681,6 +684,7 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
 
  return local_tm;
  }
+#endif
 
  if( gmtime64_r(time, &gm_tm) == NULL ) {
  TIME64_TRACE1("gmtime64_r returned null for %lld\n", *time);