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.
diff --git a/src/version.c b/src/version.c
index d92e778..40843f9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    271,
+/**/
     270,
 /**/
     269,