Phase in thread_wait when waiting for a thread to exit. Begin phasing out the spinlock object for general use; it will become a multicore-only object for core locking. Take care of plugins first.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15260 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/test_codec.c

@@ -601,6 +601,9 @@ static enum plugin_status test_track(char* filename)
     /* Save the current time before we spin up the disk to access the log */
     ticks = *rb->current_tick - starttick;
 
+    /* Be sure it is done */
+    rb->thread_wait(codecthread_id);
+
     log_text(str,true);
     
     /* Close WAV file (if there was one) */