patch 7.4.1178

Problem:    empty() doesn't work for the new special variables.
Solution:   Make empty() work. (Damien)

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1178,
 /**/
     1177,
 /**/