patch 7.4.831

Problem:    When expanding  on the command line and encountering an
            error, the command is executed anyway.
Solution:   Bail out when an error is detected.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    831,
 /**/
     830,
 /**/