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/plugin.c

@@ -512,10 +512,12 @@ static const struct plugin_api rockbox_api = {
        the API gets incompatible */
 
 #if (CONFIG_CODEC == SWCODEC)
-    spinlock_init,
-    spinlock_lock,
-    spinlock_unlock,
+    mutex_init,
+    mutex_lock,
+    mutex_unlock,
 #endif
+
+    thread_wait,
 };
 
 int plugin_load(const char* plugin, void* parameter)