build: Install gtkpopovermenubar.h

It is not listed in 'gtk_public_headers', so it is not
installed, and breaks anyone including gtk.h

diff --git a/gtk/meson.build b/gtk/meson.build
index 98f80c4f04d5984a55be541f05d72bdcd99da10d..c5bd9b154fb5e849ec6e1763d675084ffdb194a8 100644 (file)
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -551,6 +551,7 @@ gtk_public_headers = files([
   'gtkpicture.h',
   'gtkpopover.h',
   'gtkpopovermenu.h',
+  'gtkpopovermenubar.h',
   'gtkprintcontext.h',
   'gtkprintoperation.h',
   'gtkprintoperationpreview.h',