updated for version 7.2.400

Problem:    Dynamic Ruby is not initialised properly for version 1.9.1.
            Ruby cannot create strings from NULL.
Solution:   Cleanup #ifdefs.  Handle NULL like an empty string.  Add
            ruby_init_stack. (Sergey Khorev)

src/version.c

@@ -681,6 +681,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    400,
 /**/
     399,
 /**/