updated for version 7.4.538

Problem:    Tests fail with small features plus Python.
Solution:   Disallow weird combination of options.  Do not set "fdm" when
            folding is disabled.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    538,
 /**/
     537,
 /**/