updated for version 7.3.749
Problem:    Python interface doesn't build without the multi-byte feature.
Solution:   Add #ifdef. (Ken Takata)
diff --git a/src/if_py_both.h b/src/if_py_both.h
index 2398e81..339250e 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -520,7 +520,13 @@
     if (!PyArg_ParseTuple(args, "s", &expr))
 	return NULL;
 
-    return PyLong_FromLong(mb_string2cells((char_u *)expr, (int)STRLEN(expr)));
+    return PyLong_FromLong(
+#ifdef FEAT_MBYTE
+	    mb_string2cells((char_u *)expr, (int)STRLEN(expr))
+#else
+	    STRLEN(expr)
+#endif
+	    );
 }
 
 /*