updated for version 7.3.678

Problem:    Ruby .so name may not be correct.
Solution:   Use the LIBRUBY_SO entry from the config. (Vit Ondruch)

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    678,
 /**/
     677,
 /**/