libvlccore: Don't set the priority on first thread on Mac OS X.

Let's don't by pass the defaults here. This also fixes an thread error at exit.

src/libvlc.c

@@ -306,12 +306,6 @@ int libvlc_InternalInit( libvlc_int_t *p_libvlc, int i_argc,
         return VLC_EGENERIC;
     }
 
-#ifdef __APPLE__
-    /* vlc_thread_set_priority needs to query the config,
-     * so this is the earliest moment where we can set this */
-    vlc_thread_set_priority( p_libvlc, VLC_THREAD_PRIORITY_LOW );
-#endif
-
     /* Check for short help option */
     if( config_GetInt( p_libvlc, "help" ) > 0 )
     {

src/misc/threads.c

@@ -624,13 +624,8 @@ int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
 
     if( !p_priv->b_thread )
     {
-#ifndef __APPLE__
         msg_Err( p_this, "couldn't set priority of non-existent thread" );
         return ESRCH;
-#else
-# warning FIXME: this is wrong
-        p_priv->b_thread = pthread_self();
-#endif
     }
 
 #if defined( LIBVLC_USE_PTHREAD )