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_RandomSensor.cpp

@@ -124,6 +124,8 @@ bool SCA_RandomSensor::Evaluate()
 	return evaluateResult;
 }
 
+#ifndef DISABLE_PYTHON
+
 /* ------------------------------------------------------------------------- */
 /* Python functions                                                          */
 /* ------------------------------------------------------------------------- */
@@ -178,4 +180,6 @@ int SCA_RandomSensor::pyattr_set_seed(void *self_v, const KX_PYATTRIBUTE_DEF *at
 	return PY_SET_ATTR_SUCCESS;
 }
 
+#endif // DISABLE_PYTHON
+
 /* eof */