patch 7.4.2216

Problem:    Test fails without the +sign feature.
Solution:   Only check for signcolumn with the +sign feature.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2216,
 /**/
     2215,
 /**/