patch 8.1.0434: copy_loclist() is too long

Problem:    copy_loclist() is too long.
Solution:   Split in multiple functions. (Yegappan Lakshmanan)
diff --git a/src/proto/quickfix.pro b/src/proto/quickfix.pro
index 26a5de0..c9c3a8c 100644
--- a/src/proto/quickfix.pro
+++ b/src/proto/quickfix.pro
@@ -1,7 +1,7 @@
 /* quickfix.c */
 int qf_init(win_T *wp, char_u *efile, char_u *errorformat, int newlist, char_u *qf_title, char_u *enc);
 void qf_free_all(win_T *wp);
-void copy_loclist(win_T *from, win_T *to);
+void copy_loclist_stack(win_T *from, win_T *to);
 void qf_jump(qf_info_T *qi, int dir, int errornr, int forceit);
 void qf_list(exarg_T *eap);
 void qf_age(exarg_T *eap);