Add missing headers to panda/pipeline (when doing non-composite builds).

panda/src/pipeline/lightMutexDirect.h

@@ -17,6 +17,7 @@
 
 #include "pandabase.h"
 #include "mutexImpl.h"
+#include "pnotify.h"
 
 class Thread;
 

panda/src/pipeline/psemaphore.h

@@ -18,6 +18,7 @@
 #include "pandabase.h"
 #include "pmutex.h"
 #include "conditionVar.h"
+#include "mutexHolder.h"
 
 ////////////////////////////////////////////////////////////////////
 //       Class : Semaphore

panda/src/pipeline/threadPriority.cxx

@@ -13,6 +13,8 @@
 ////////////////////////////////////////////////////////////////////
 
 #include "threadPriority.h"
+#include "pnotify.h" // nassertr
+#include "pipeline.h"
 
 ostream &
 operator << (ostream &out, ThreadPriority pri) {