patch 8.2.2915: MS-Windows: when using "default" for encoding utf-8 is used

Problem:    MS-Windows: when using "default" for encoding utf-8 is used.
Solution:   Use the system encoding. (Ken Takata, closes #8300)
diff --git a/src/version.c b/src/version.c
index 56ce534..8584778 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2915,
+/**/
     2914,
 /**/
     2913,