Merge pull request #503 from wmww/fix-c-include

Fix psmoveapi.h when included in C code

Author: thp

include/psmoveapi.h

@@ -77,7 +77,7 @@ struct EventReceiver {
 };
 
 ADDAPI void
-ADDCALL psmoveapi_init(EventReceiver *receiver, void *user_data);
+ADDCALL psmoveapi_init(struct EventReceiver *receiver, void *user_data);
 
 ADDAPI void
 ADDCALL psmoveapi_update();