patch 7.4.1951

Problem:    Ruby test is old style.
Solution:   Convert to a new style test. (Ken Takata)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1951,
 /**/
     1950,
 /**/