patch 8.2.0500: using the same loop in many places

Problem:    Using the same loop in many places.
Solution:   Define more FOR_ALL macros. (Yegappan Lakshmanan, closes #5339)
diff --git a/src/eval.c b/src/eval.c
index 7867375..6d666e6 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -3973,11 +3973,11 @@
 	abort = abort || set_ref_in_item(&aucmd_win->w_winvar.di_tv, copyID,
 								  NULL, NULL);
 #ifdef FEAT_PROP_POPUP
-    for (wp = first_popupwin; wp != NULL; wp = wp->w_next)
+    FOR_ALL_POPUPWINS(wp)
 	abort = abort || set_ref_in_item(&wp->w_winvar.di_tv, copyID,
 								  NULL, NULL);
     FOR_ALL_TABPAGES(tp)
-	for (wp = tp->tp_first_popupwin; wp != NULL; wp = wp->w_next)
+	FOR_ALL_POPUPWINS_IN_TAB(tp, wp)
 		abort = abort || set_ref_in_item(&wp->w_winvar.di_tv, copyID,
 								  NULL, NULL);
 #endif