patch 7.4.1672

Problem:    The Dvorak support is a bit difficult to install.
Solution:   Turn it into an optional package.

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1672,
 /**/
     1671,
 /**/