patch 8.1.1257: MSVC: name of object directory now always right

Problem:    MSVC: name of object directory now always right.
Solution:   Adjust comment.  Don't use different directory for DIRECTX.  Do
            use different directory for USE_MSVCRT. (Ken Takata, closes #4333)
diff --git a/src/version.c b/src/version.c
index 35ef1ae..e5582e9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1257,
+/**/
     1256,
 /**/
     1255,