[gtk/matthiasc/for-master] docs: Ignore more generated Wayland protocol headers

[Matthias Clasen <matthiasc src gnome org>]

commit b215297a53e5a1bfbf4bc03bff23e07aedc64c1c
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Nov 25 14:49:21 2020 -0500

    docs: Ignore more generated Wayland protocol headers
    
    These inject mysterious words like Airbrush, Lense and
    Mouse into the list of undocumented apis. No need for that.

 docs/reference/gdk/meson.build | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/docs/reference/gdk/meson.build b/docs/reference/gdk/meson.build
index 5713c4ec5e..ed7e4ddb36 100644
--- a/docs/reference/gdk/meson.build
+++ b/docs/reference/gdk/meson.build
@@ -43,12 +43,17 @@ private_headers = [
   'x11/gdkeventsource.h',
   'gtk-primary-selection-client-protocol.h',
   'gtk-shell-client-protocol.h',
+  'idle-inhibit-unstable-v1-client-protocol.h',
   'keyboard-shortcuts-inhibit-unstable-v1-client-protocol.h',
   'pointer-gestures-unstable-v1-client-protocol.h',
+  'primary-selection-unstable-v1-client-protocol.h',
   'server-decoration-client-protocol.h',
   'tablet-unstable-v2-client-protocol.h',
   'xdg-foreign-unstable-v1-client-protocol.h',
   'xdg-shell-unstable-v6-client-protocol.h',
+  'xdg-output-unstable-v1-client-protocol.h',
+  'xdg-shell-client-protocol.h',
+  'xdg-shell-unstable-v6-client-protocol.h',
   'win32',
   'quartz',
   'broadway',