updated for version 7.4a.006

Problem:    Failure in po file check goes unnoticed.
Solution:   Fail "make test" if the po file check fails.

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    6,
 /**/
     5,
 /**/