patch 8.0.0781: MS-Windows: memory leak when using :terminal

Problem:    MS-Windows: Memory leak when using :terminal.
Solution:   Handle failures properly. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index ddac62f..f62d3f0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    781,
+/**/
     780,
 /**/
     779,