patch 9.0.1390: FOR_ALL_ macros are defined in an unexpected file

Problem:    FOR_ALL_ macros are defined in an unexpected file.
Solution:   Move FOR_ALL_ macros to macros.h.  Add FOR_ALL_HASHTAB_ITEMS.
            (Yegappan Lakshmanan, closes #12109)
diff --git a/src/evalvars.c b/src/evalvars.c
index b2343c0..b123542 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -2317,7 +2317,7 @@
 		{
 		    // recursive: lock/unlock the items the List contains
 		    todo = (int)d->dv_hashtab.ht_used;
-		    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
+		    FOR_ALL_HASHTAB_ITEMS(&d->dv_hashtab, hi, todo)
 		    {
 			if (!HASHITEM_EMPTY(hi))
 			{
@@ -3571,7 +3571,7 @@
 
     hash_lock(ht);
     todo = (int)ht->ht_used;
-    for (hi = ht->ht_array; todo > 0; ++hi)
+    FOR_ALL_HASHTAB_ITEMS(ht, hi, todo)
     {
 	if (!HASHITEM_EMPTY(hi))
 	{