add options for individual compile

panda/src/pgraph/Sources.pp

@@ -273,6 +273,12 @@
 
   #define IGATESCAN all
 
+// Uncomment these lines to compile everything individually instead of
+// combining into pgraph_composite*.cxx.
+
+//  #define COMBINED_SOURCES
+//  #define SOURCES $[SOURCES] $[INCLUDED_SOURCES]
+
 #end lib_target