patch 8.2.1312: MS-Windows: terminal test may fail if dir.exe exists

Problem:    MS-Windows: terminal test may fail if dir.exe exists.
Solution:   Use dir.com. (Ken Takata, closes #6557)
diff --git a/src/version.c b/src/version.c
index 93da0a8..26bd7ac 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1312,
+/**/
     1311,
 /**/
     1310,