gst1-plugins-ugly: fix typo in variable name

As pointed out during the check-package discussion, there is a typo in a
variable name:

http://lists.busybox.net/pipermail/buildroot/2016-December/180765.html

Reported-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gstreamer1/gst1-plugins-ugly/gst1-plugins-ugly.mk

@@ -95,7 +95,7 @@ endif
 ifeq ($(BR2_PACKAGE_GST1_PLUGINS_UGLY_PLUGIN_MPEG2DEC),y)
 GST1_PLUGINS_UGLY_CONF_OPTS += --enable-mpeg2dec
 GST1_PLUGINS_UGLY_DEPENDENCIES += libmpeg2
-GST1_PLUGINS_ULGY_HAS_GPL_LICENSE = y
+GST1_PLUGINS_UGLY_HAS_GPL_LICENSE = y
 else
 GST1_PLUGINS_UGLY_CONF_OPTS += --disable-mpeg2dec
 endif