patch 8.2.0249: MS-Windows: various warnings

Problem:    MS-Windows: various warnings.
Solution:   Set the charset to utf-8. Add _WIN32_WINNT and _USING_V110_SDK71_.
            (Ken Takata, closes #5625)
diff --git a/src/version.c b/src/version.c
index ba79618..7c31c19 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    249,
+/**/
     248,
 /**/
     247,