python-pyxml: add PYTHON_PYXML_VERSION variable to url address

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-pyxml/python-pyxml.mk

@@ -6,7 +6,7 @@
 
 PYTHON_PYXML_VERSION = 0.8.4
 PYTHON_PYXML_SOURCE = PyXML-$(PYTHON_PYXML_VERSION).tar.gz
-PYTHON_PYXML_SITE = http://downloads.sourceforge.net/project/pyxml/pyxml/0.8.4/
+PYTHON_PYXML_SITE = http://downloads.sourceforge.net/project/pyxml/pyxml/$(PYTHON_PYXML_VERSION)/
 PYTHON_PYXML_LICENSE = BSD-3c
 PYTHON_PYXML_LICENSE_FILES = LICENCE
 PYTHON_PYXML_SETUP_TYPE = distutils