[gtk/carlosgc/fix-build] build: add gtkoverlaylayout.h to the list of public headers

[Carlos Garcia Campos <carlosgc src gnome org>]

commit a2aa25d28e45ab07198784cb7a9f7a58b9e2cbde
Author: Carlos Garcia Campos <cgarcia igalia com>
Date:   Wed May 27 11:05:12 2020 +0200

    build: add gtkoverlaylayout.h to the list of public headers
    
    GtkOverlayLayout is now public but the header is not installed.

 gtk/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/meson.build b/gtk/meson.build
index 56fd8399d9..9012ae1a5c 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -534,6 +534,7 @@ gtk_public_headers = files([
   'gtknotebook.h',
   'gtkorientable.h',
   'gtkoverlay.h',
+  'gtkoverlaylayout.h',
   'gtkpadcontroller.h',
   'gtkpagesetup.h',
   'gtkpaned.h',