patch 8.2.4325: 'wildmenu' only shows few matches

Problem:    'wildmenu' only shows few matches.
Solution:   Add the "pum" option: use a popup menu to show the matches.
            (Yegappan Lakshmanan et al., closes #9707)
diff --git a/src/vim.h b/src/vim.h
index 33d294c..67b4e33 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -809,6 +809,8 @@
 #define WILD_ALL		6
 #define WILD_LONGEST		7
 #define WILD_ALL_KEEP		8
+#define WILD_CANCEL		9
+#define WILD_APPLY		10
 
 #define WILD_LIST_NOTFOUND	    0x01
 #define WILD_HOME_REPLACE	    0x02