gconf: use $() to reference make variables instead of ${}

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/gconf/gconf.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 GCONF_VERSION = 3.2.6
-GCONF_SOURCE = GConf-${GCONF_VERSION}.tar.xz
+GCONF_SOURCE = GConf-$(GCONF_VERSION).tar.xz
 GCONF_SITE = http://ftp.gnome.org/pub/gnome/sources/GConf/3.2
 GCONF_CONF_OPTS = --disable-orbit
 GCONF_DEPENDENCIES = dbus dbus-glib libglib2 libxml2 \