patch 8.1.0271: 'incsearch' doesn't work for :s, :g or :v

Problem:    'incsearch' doesn't work for :s, :g or :v.
Solution:   Also use 'incsearch' for other commands that use a pattern.

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    271,
 /**/
     270,
 /**/