patch 8.2.4874: Win32 GUI: horizontal scroll wheel not handled properly

Problem:    Win32 GUI: horizontal scroll wheel not handled properly.
Solution:   Also handle WM_MOUSEHWHEEL. (closes #10309)
diff --git a/src/version.c b/src/version.c
index 3242c14..33e2a5f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4874,
+/**/
     4873,
 /**/
     4872,