patch 8.1.2255: ":term ++shell" does not work on MS-Windows

Problem:    ":term ++shell" does not work on MS-Windows.
Solution:   Add MS-Windows support.
diff --git a/src/version.c b/src/version.c
index 79f3576..4315a17 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2255,
+/**/
     2254,
 /**/
     2253,