updated for version 7.4.581

Problem:    Compiler warnings for unitinialized variables. (John Little)
Solution:   Initialize the variables.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    581,
 /**/
     580,
 /**/