[gtk/gtk-3-22] Add missing private header to the build

[Emmanuele Bassi <ebassi src gnome org>]

commit f82a6421f4c4716b50ed13463a3d43d69445638d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Feb 14 10:36:24 2018 +0000

    Add missing private header to the build
    
    Closes: #26
    
            https://bugzilla.gnome.org/show_bug.cgi?id=793442

 gtk/Makefile.am | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 842c2f97c8..63f88e9476 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -481,6 +481,7 @@ gtk_private_h_sources =             \
        gtkfilesystemmodel.h    \
        gtkfontchooserprivate.h \
        gtkfontchooserutils.h   \
+       gtkfontchooserwidgetprivate.h \
        gtkgestureprivate.h     \
        gtkgesturedragprivate.h \
        gtkgesturelongpressprivate.h    \