option to build the BGE without python, uses existing python check (cmake and scons)

when python is disabled videotextures are not built.

source/gameengine/Ketsji/KX_ObjectActuator.cpp

@@ -317,7 +317,7 @@ bool KX_ObjectActuator::isValid(KX_ObjectActuator::KX_OBJECT_ACT_VEC_TYPE type)
 	return res;
 }
 
-
+#ifndef DISABLE_PYTHON
 
 /* ------------------------------------------------------------------------- */
 /* Python functions                                                          */
@@ -641,4 +641,6 @@ int KX_ObjectActuator::pyattr_set_reference(void *self, const struct KX_PYATTRIB
 	return PY_SET_ATTR_SUCCESS;
 }
 
+#endif // DISABLE_PYTHON
+
 /* eof */