patch 7.4.705

Problem:    Can't build with Ruby 2.2.
Solution:   Add #ifdefs to handle the incompatible change. (Andrei Olsen)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    705,
 /**/
     704,
 /**/