patch 7.4.1608

Problem:    string() doesn't handle a partial.
Solution:   Make a string from a partial.

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1608,
 /**/
     1607,
 /**/