patch 8.1.2271: build error if FEAT_TAG_BINS is not defined

Problem:    Build error if FEAT_TAG_BINS is not defined. (John Marriott)
Solution:   Add #ifdef.
diff --git a/src/version.c b/src/version.c
index bd442f5..5ceb369 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2271,
+/**/
     2270,
 /**/
     2269,