Trying to speed compilation a bit

pandatool/src/dxf/dxf_composite1.cxx

@@ -0,0 +1,4 @@
+#include "dxfFile.cxx"
+#include "dxfLayer.cxx"
+#include "dxfLayerMap.cxx"
+#include "dxfVertex.cxx"

pandatool/src/pandatoolbase/pandatoolbase_composite1.cxx

@@ -0,0 +1,6 @@
+#include "config_pandatoolbase.cxx"
+#include "pathStore.cxx"
+#include "pathReplace.cxx"
+#include "animationConvert.cxx"
+#include "distanceUnit.cxx"
+#include "pandatoolbase.cxx"