[pygobject] Fix build

[Jasper St. Pierre <jstpierre src gnome org>]

commit 62c2e962a225ec2527aa3d7406aa0dae232a0886
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri May 25 17:09:55 2012 -0400

    Fix build
    
    libregress now needs cairo-gobject

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4210730..08d6a9c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -185,7 +185,7 @@ dnl gio
 PKG_CHECK_MODULES(GIO, gio-2.0 >= gio_required_version)
 
 # we always need cairo (not pycairo) for building the tests
-PKG_CHECK_MODULES(CAIRO, cairo)
+PKG_CHECK_MODULES(CAIRO, cairo cairo-gobject)
 
 AC_ARG_ENABLE(cairo,
     AC_HELP_STRING([--enable-cairo], [Enable Cairo bindings using introspection information]),