patch 7.4.739

Problem:    In a string "\U" only takes 4 digits, while after CTRL-V U eight
            digits can be used.
Solution:   Make "\U" also take eight digits. (Christian Brabandt)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    739,
 /**/
     738,
 /**/