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_AlwaysSensor.cpp

@@ -98,6 +98,8 @@ bool SCA_AlwaysSensor::Evaluate()
 	return result;
 }
 
+#ifndef DISABLE_PYTHON
+
 /* ------------------------------------------------------------------------- */
 /* Python functions                                                          */
 /* ------------------------------------------------------------------------- */
@@ -133,4 +135,6 @@ PyAttributeDef SCA_AlwaysSensor::Attributes[] = {
 	{ NULL }	//Sentinel
 };
 
+#endif
+
 /* eof */