CMake: Update to latest upstream Panda3D changes.

panda/src/pgraphnodes/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(P3PGRAPHNODES_HEADERS
     ambientLight.h ambientLight.I
     callbackNode.h callbackNode.I
+    computeNode.h computeNode.I
     config_pgraphnodes.h
     directionalLight.h directionalLight.I
     fadeLodNode.I fadeLodNode.h fadeLodNodeData.h
@@ -21,6 +22,7 @@ set(P3PGRAPHNODES_HEADERS
 set(P3PGRAPHNODES_SOURCES
     ambientLight.cxx
     callbackNode.cxx
+    computeNode.cxx
     config_pgraphnodes.cxx
     directionalLight.cxx
     fadeLodNode.cxx fadeLodNodeData.cxx

panda/src/putil/pythonCallbackObject.h

@@ -19,6 +19,7 @@
 
 #ifdef HAVE_PYTHON
 
+#include "py_panda.h"
 #include "callbackObject.h"
 
 ////////////////////////////////////////////////////////////////////