patch 7.4.1912

Problem:    No test for using setqflist() on an older quickfix list.
Solution:   Add a couple of tests.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1912,
 /**/
     1911,
 /**/