patch 8.0.0731: cannot build the terminal feature on MS-Windows

Problem:    Cannot build the terminal feature on MS-Windows.
Solution:   Add the Makefile changes. (Yasuhiro Matsumoto, closes #1851)
diff --git a/src/version.c b/src/version.c
index 97ef94e..9c94fe8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    731,
+/**/
     730,
 /**/
     729,