patch 7.4.2161

Problem:    Expression test fails without conceal feature.
Solution:   Only check "conceal" with the conceal feature.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2161,
 /**/
     2160,
 /**/