patch 7.4.720

Problem:    Can't build with Visual Studio 2015.
Solution:   Recognize the "version 14" numbers and omit /nodefaultlib when
            appropriate. (Paul Moore)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    720,
 /**/
     719,
 /**/