patch 7.4.1794

Problem:    Can't build on MS-Windows.
Solution:   Add missing declaration.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1794,
 /**/
     1793,
 /**/