patch 7.4.1871

Problem:    Appending to the quickfix list while the quickfix window is open
            is very slow.
Solution:   Do not delete all the lines, only append the new ones.  Avoid
            using a window while updating the list. (closes #841)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1871,
 /**/
     1870,
 /**/