[gtk/gtk-3-24: 1/2] build: Add missing sources for the GdkX11 gir build

[Matthias Clasen <matthiasc src gnome org>]

commit 15a7a93d10a2bda5d5836d7b16df4959bf058edd
Author: Christoph Reiter <creiter src gnome org>
Date:   Sat Mar 30 11:56:12 2019 +0100

    build: Add missing sources for the GdkX11 gir build
    
    Noticed while diffing .gir files with the meson port.

 gdk/Makefile.am | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index e25b57ba50..ecbc63d229 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -274,8 +274,10 @@ x11_introspection_files =          \
        x11/gdkeventsource.c            \
        x11/gdkeventtranslator.c        \
        x11/gdkgeometry-x11.c           \
+       x11/gdkglcontext-x11.c          \
        x11/gdkkeys-x11.c               \
        x11/gdkmain-x11.c               \
+       x11/gdkmonitor-x11.c            \
        x11/gdkproperty-x11.c           \
        x11/gdkscreen-x11.c             \
        x11/gdkselection-x11.c          \
@@ -298,7 +300,9 @@ x11_introspection_files =           \
        x11/gdkx11display.h             \
        x11/gdkx11displaymanager.h      \
        x11/gdkx11dnd.h                 \
+       x11/gdkx11glcontext.h           \
        x11/gdkx11keys.h                \
+       x11/gdkx11monitor.h             \
        x11/gdkx11property.h            \
        x11/gdkx11screen.h              \
        x11/gdkx11selection.h           \