patch 9.1.0618: cannot mark deprecated attributes in completion menu

Problem:  cannot mark deprecated attributes in completion menu
Solution: add hl_group to the Dictionary of supported completion fields
          (glepnir)

closes: #15314

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/structs.h b/src/structs.h
index 6309211..2e8efa8 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -4466,12 +4466,13 @@
  */
 typedef struct
 {
-    char_u	*pum_text;	// main menu text
-    char_u	*pum_kind;	// extra kind text (may be truncated)
-    char_u	*pum_extra;	// extra menu text (may be truncated)
-    char_u	*pum_info;	// extra info
-    int		pum_score;	// fuzzy match score
-    int		pum_idx;	// index of item before sorting by score
+    char_u	*pum_text;	  // main menu text
+    char_u	*pum_kind;	  // extra kind text (may be truncated)
+    char_u	*pum_extra;	  // extra menu text (may be truncated)
+    char_u	*pum_info;	  // extra info
+    int		pum_score;	  // fuzzy match score
+    int		pum_idx;	  // index of item before sorting by score
+    int		pum_extrahlattr;  // extra highlight group attr for combine
 } pumitem_T;
 
 /*