[rygel] build: Fix typo in configure.ac, missing $ on GIO_REQUIRED.

[Krzesimir Nowak <krnowak src gnome org>]

commit e08cfa9d075020026e053d1553e463e6c3ada457
Author: Krzesimir Nowak <krnowak openismus com>
Date:   Wed Jan 30 14:20:27 2013 +0100

    build: Fix typo in configure.ac, missing $ on GIO_REQUIRED.
    
    Sent by Andreas Henriksson.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 18b5996..799cab1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -105,7 +105,7 @@ AS_IF([test "x$with_media_engine" = "xgstreamer"],
                            gstreamer-pbutils-1.0 >= $GSTPBU_REQUIRED
                            gstreamer-app-1.0 >= $GSTREAMER_APP_REQUIRED
                            gupnp-dlna-2.0 >= $GUPNP_DLNA_REQUIRED
-                           gio-2.0 >= GIO_REQUIRED])
+                           gio-2.0 >= $GIO_REQUIRED])
         RYGEL_MEDIA_ENGINE_GSTREAMER_DEPS_VALAFLAGS="$RYGEL_COMMON_MODULES_VALAFLAGS --pkg gstreamer-base-1.0 --pkg gstreamer-pbutils-1.0 --pkg gupnp-dlna-2.0"
         AC_SUBST([RYGEL_MEDIA_ENGINE_GSTREAMER_DEPS_VALAFLAGS])