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

when python is disabled videotextures are not built.

source/gameengine/GameLogic/SCA_KeyboardSensor.cpp

@@ -403,6 +403,7 @@ void SCA_KeyboardSensor::LogKeystrokes(void)
 	}
 }
 
+#ifndef DISABLE_PYTHON
 
 /* ------------------------------------------------------------------------- */
 /* Python Functions						       */
@@ -495,6 +496,7 @@ PyObject* SCA_KeyboardSensor::pyattr_get_events(void *self_v, const KX_PYATTRIBU
 	return resultlist;
 }
 
+#endif // DISABLE_PYTHON
 
 /* Accessed from python */