[gtk/gbsneto/gtkeventcontrollerfocus] build: Install gtkeventcontrollerfocus.h

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8e14b21e527b95c2b75d78ec3de60519cd791209
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Mar 3 00:38:13 2020 -0300

    build: Install gtkeventcontrollerfocus.h
    
    It's a public class, and is included by gtk.h. Ship it.

 gtk/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/meson.build b/gtk/meson.build
index d68b54539c..bf7e08a06c 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -472,6 +472,7 @@ gtk_public_headers = files([
   'gtkentrycompletion.h',
   'gtkenums.h',
   'gtkeventcontroller.h',
+  'gtkeventcontrollerfocus.h',
   'gtkeventcontrollerkey.h',
   'gtkeventcontrollerscroll.h',
   'gtkeventcontrollermotion.h',