patch 9.1.0431: eval.c is too long

Problem:  eval.c is too long
Solution: Move garbage collection code to new gc.c file
          (Yegappan Lakshmanan)

closes: #14824

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/proto/gc.pro b/src/proto/gc.pro
new file mode 100644
index 0000000..e13dbda
--- /dev/null
+++ b/src/proto/gc.pro
@@ -0,0 +1,12 @@
+/* gc.c */
+int get_copyID(void);
+int garbage_collect(int testing);
+int set_ref_in_ht(hashtab_T *ht, int copyID, list_stack_T **list_stack);
+int set_ref_in_dict(dict_T *d, int copyID);
+int set_ref_in_list(list_T *ll, int copyID);
+int set_ref_in_list_items(list_T *l, int copyID, ht_stack_T **ht_stack);
+int set_ref_in_callback(callback_T *cb, int copyID);
+int set_ref_in_item_class(class_T *cl, int copyID, ht_stack_T **ht_stack, list_stack_T **list_stack);
+int set_ref_in_item(typval_T *tv, int copyID, ht_stack_T **ht_stack, list_stack_T **list_stack);
+/* vim: set ft=c : */
+