patch 8.2.2704: adding a lot of completions can be a bit slow

Problem:    Adding a lot of completions can be a bit slow.
Solution:   Use fast_breakcheck() instead of ui_breakcheck() when adding a
            list of completions. (Ben Jackson, closes #8061)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2704,
 /**/
     2703,
 /**/