[gnome-contacts] Add gio-unix-2.0 to the pkg-config check

[David King <davidk src gnome org>]

commit 984e9f3255e4fb1db7ba3d9754d43736440ca4a8
Author: David King <dking redhat com>
Date:   Mon Oct 5 18:01:42 2015 -0400

    Add gio-unix-2.0 to the pkg-config check
    
    https://bugzilla.gnome.org/show_bug.cgi?id=747570

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fd6b217..8463106 100644
--- a/configure.ac
+++ b/configure.ac
@@ -41,6 +41,7 @@ pkg_modules="gtk+-3.0 >= 3.16.0
             glib-2.0 >= 2.37.6
             gmodule-export-2.0
             gnome-desktop-3.0
+            gio-unix-2.0
             folks >= 0.9.5
             folks-telepathy
             folks-eds