[glib] Ship gio.xml in tarballs

[Emilio Pozuelo Monfort <epm src gnome org>]

commit 5cede43df64501d42f626dd6749f45e418e8e152
Author: Emilio Pozuelo Monfort <pochu27 gmail com>
Date:   Mon Jul 18 23:51:26 2016 +0200

    Ship gio.xml in tarballs
    
    Fixes the documentation build.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768936

 docs/reference/gio/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gio/Makefile.am b/docs/reference/gio/Makefile.am
index 48f8432..5741a3e 100644
--- a/docs/reference/gio/Makefile.am
+++ b/docs/reference/gio/Makefile.am
@@ -141,6 +141,7 @@ content_files =                     \
        gresource.xml           \
        gdbus.xml               \
        gdbus-codegen.xml       \
+       gio.xml                 \
        $(NULL)
 
 expand_content_files =         \