[gedit] Fix compilation on macOS with gtk 3.24.14

[Sébastien Wilmet <swilmet src gnome org>]

commit c6ca8a0baaae5ac39582a253aab4437f9b478e8e
Author: Tom Schoonjans <Tom Schoonjans rfi ac uk>
Date:   Fri Mar 6 14:51:10 2020 +0000

    Fix compilation on macOS with gtk 3.24.14

 gedit/gedit-app-osx.m                 | 4 ++++
 gedit/gedit-file-chooser-dialog-osx.m | 2 ++
 2 files changed, 6 insertions(+)
---
diff --git a/gedit/gedit-app-osx.m b/gedit/gedit-app-osx.m
index 07774cc53..5df1b94da 100644
--- a/gedit/gedit-app-osx.m
+++ b/gedit/gedit-app-osx.m
@@ -32,6 +32,10 @@
 #include "gedit-commands.h"
 #include "gedit-commands-private.h"
 #include "gedit-recent.h"
+#import <AppKit/AppKit.h>
+
+NSWindow *gdk_quartz_window_get_nswindow(GdkWindow *window);
+NSEvent *gdk_quartz_event_get_nsevent(GdkEvent *event);
 
 static GeditWindow *
 ensure_window (GeditAppOSX *app,
diff --git a/gedit/gedit-file-chooser-dialog-osx.m b/gedit/gedit-file-chooser-dialog-osx.m
index ecfbee62a..f897c81cd 100644
--- a/gedit/gedit-file-chooser-dialog-osx.m
+++ b/gedit/gedit-file-chooser-dialog-osx.m
@@ -29,6 +29,8 @@
 #include "gedit-encodings-dialog.h"
 #include "gedit-utils.h"
 
+NSWindow *gdk_quartz_window_get_nswindow(GdkWindow *window);
+
 struct _GeditFileChooserDialogOSX
 {
        GObject parent_instance;