[gnome-settings-daemon] dummy: Fix missing dependency in some setups

[Bastien Nocera <hadess src gnome org>]

commit efe58078adb22199542508dd470207436e1f2268
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Oct 13 18:53:51 2016 +0300

    dummy: Fix missing dependency in some setups
    
    /usr/bin/ld: gsd_dummy-main.o: undefined reference to symbol 'g_dbus_proxy_call'
    /mnt/wd20ezrx-00dc0b0/JHBuild/3.24/install/lib/libgio-2.0.so.0: error adding symbols: DSO missing from 
command line
    
    Note that the gio dependency should be dragged in via libgsd, but isn't
    depending on the build flags used.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772900

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 805b9ce..d30c4d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -171,6 +171,7 @@ PKG_CHECK_MODULES(DATETIME,
                  polkit-gobject-1 >= $POLKIT_REQUIRED_VERSION)
 
 PKG_CHECK_MODULES(DUMMY,
+                 gio-2.0
                  glib-2.0)
 
 PKG_CHECK_MODULES(HOUSEKEEPING,