patch 8.1.1677: tests get stuck when running into an existing swapfile

Problem:    Tests get stuck when running into an existing swapfile.
Solution:   Set v:swapchoice to "q" and report an error. (Daniel Hahler,
            closes #4644)

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1677,
 /**/
     1676,
 /**/