patch 8.2.3524: GUI: ligatures are not used
Problem: GUI: ligatures are not used.
Solution: Add the 'guiligatures' option. (Dusan Popovic, closes #8933)
diff --git a/src/proto/gui.pro b/src/proto/gui.pro
index d762420..209e7f1 100644
--- a/src/proto/gui.pro
+++ b/src/proto/gui.pro
@@ -7,6 +7,7 @@
void gui_shell_closed(void);
int gui_init_font(char_u *font_list, int fontset);
int gui_get_wide_font(void);
+void gui_set_ligatures(void);
void gui_update_cursor(int force, int clear_selection);
void gui_position_menu(void);
int gui_get_base_width(void);