patch 9.0.1577: MS-Windows: context menu translations may be wrong

Problem:    MS-Windows: context menu translations may be wrong.
Solution:   Set the encoding before using gettext(). (Ken Takata,
            closes #12441, closes #12431)
diff --git a/src/version.c b/src/version.c
index d9ce3d1..02be5bf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1577,
+/**/
     1576,
 /**/
     1575,