patch 7.4.1627

Problem:    Channel out_cb and err_cb are not tested.
Solution:   Add a test.

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1627,
 /**/
     1626,
 /**/