patch 7.4.1433
Problem:    The Sniff interface is no longer useful, the tool has not been
            available for may years.
Solution:   Delete the Sniff interface and related code.
diff --git a/src/charset.c b/src/charset.c
index 2414b2a..ad3f8bc 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1761,8 +1761,7 @@
     return p;
 }
 
-#if defined(FEAT_LISTCMDS) || defined(FEAT_SIGNS) || defined(FEAT_SNIFF) \
-	|| defined(PROTO)
+#if defined(FEAT_LISTCMDS) || defined(FEAT_SIGNS) || defined(PROTO)
 /*
  * skiptowhite_esc: Like skiptowhite(), but also skip escaped chars
  */