mayapath: remove PANDA_INCOMPATIBLE_PYTHON var, no longer used

pandatool/src/mayaprogs/mayapath.cxx

@@ -443,11 +443,6 @@ main(int argc, char *argv[]) {
 
 #endif // IS_OSX
 
-  // When this is set, Panda3D will try not to use any functions from the
-  // CPython API.  This is necessary because Maya links with its own copy of
-  // Python, which may be incompatible with ours.
-  putenv((char *)"PANDA_INCOMPATIBLE_PYTHON=1");
-
   // Now that we have set up the environment variables properly, chain to the
   // actual maya2egg_bin (or whichever) executable.