Fix T49342: TypeError when autocompleting bpy.app.something.

Regression from rB036c006cefe471. We can't use self here, self is bpy.app, not pydescriptor of python path getsetter...

So for now, do not try to replace getsetter by actual value in bpy.app's dict,
just return static var generated on first run.

Should be safe for 2.78.

source/blender/python/intern/bpy_app.c

@@ -234,7 +234,7 @@ static int bpy_app_debug_set(PyObject *UNUSED(self), PyObject *value, void *clos
 	return 0;
 }
 
-
+#define BROKEN_BINARY_PATH_PYTHON_HACK
 
 PyDoc_STRVAR(bpy_app_binary_path_python_doc,
 "String, the path to the python executable (read-only)"
@@ -251,14 +251,18 @@ static PyObject *bpy_app_binary_path_python_get(PyObject *self, void *UNUSED(clo
 		        fullpath, sizeof(fullpath),
 		        PY_MAJOR_VERSION, PY_MINOR_VERSION);
 		ret = PyC_UnicodeFromByte(fullpath);
-		PyDict_SetItem(BlenderAppType.tp_dict, PyDescr_NAME(self), ret);
+#ifdef BROKEN_BINARY_PATH_PYTHON_HACK
+		Py_INCREF(ret);
+		UNUSED_VARS(self);
+#else
+		PyDict_SetItem(BlenderAppType.tp_dict, /* XXX BAAAADDDDDD! self is not a PyDescr at all! it's bpy.app!!! */ PyDescr_NAME(self), ret);
+#endif
 	}
 	else {
 		Py_INCREF(ret);
 	}
 
 	return ret;
-
 }
 
 PyDoc_STRVAR(bpy_app_debug_value_doc,