patch 8.2.4579: cannot use page-up and page-down in the cmdline popup menu

Problem:    Cannot use page-up and page-down in the command line completion
            popup menu.
Solution:   Check for to page-up and page-down keys. (Yegappan Lakshmanan,
            closes #9960)
diff --git a/src/vim.h b/src/vim.h
index 5f43ac7..d7a2464 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -818,6 +818,8 @@
 #define WILD_ALL_KEEP		8
 #define WILD_CANCEL		9
 #define WILD_APPLY		10
+#define WILD_PAGEUP		11
+#define WILD_PAGEDOWN		12
 
 #define WILD_LIST_NOTFOUND	    0x01
 #define WILD_HOME_REPLACE	    0x02