patch 7.4.1815

Problem:    Compiler warnings for unused variables. (Ajit Thakkar)
Solution:   Add a dummy initialization. (Yasuhiro Matsumoto)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1815,
 /**/
     1814,
 /**/