patch 8.1.2082: some files have a weird name to fit in 8.3 characters

Problem:    Some files have a weird name to fit in 8.3 characters.
Solution:   Use a nicer names.
diff --git a/src/proto/popupmenu.pro b/src/proto/popupmenu.pro
new file mode 100644
index 0000000..c019663
--- /dev/null
+++ b/src/proto/popupmenu.pro
@@ -0,0 +1,18 @@
+/* popupmnu.c */
+void pum_display(pumitem_T *array, int size, int selected);
+void pum_call_update_screen(void);
+int pum_under_menu(int row, int col);
+void pum_redraw(void);
+void pum_undisplay(void);
+void pum_clear(void);
+int pum_visible(void);
+void pum_may_redraw(void);
+int pum_get_height(void);
+void pum_set_event_info(dict_T *dict);
+int split_message(char_u *mesg, pumitem_T **array);
+void ui_remove_balloon(void);
+void ui_post_balloon(char_u *mesg, list_T *list);
+void ui_may_remove_balloon(void);
+void pum_show_popupmenu(vimmenu_T *menu);
+void pum_make_popup(char_u *path_name, int use_mouse_pos);
+/* vim: set ft=c : */
diff --git a/src/proto/popupmnu.pro b/src/proto/popupmnu.pro
index c019663..f5b6c0c 100644
--- a/src/proto/popupmnu.pro
+++ b/src/proto/popupmnu.pro
@@ -1,4 +1,4 @@
-/* popupmnu.c */
+/* popupmenu.c */
 void pum_display(pumitem_T *array, int size, int selected);
 void pum_call_update_screen(void);
 int pum_under_menu(int row, int col);