xbmc: use github call

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xbmc/xbmc.mk

@@ -5,8 +5,7 @@
 ################################################################################
 
 XBMC_VERSION = 13.2-Gotham
-XBMC_SOURCE = $(XBMC_VERSION).tar.gz
-XBMC_SITE = https://github.com/xbmc/xbmc/archive
+XBMC_SITE = $(call github,xbmc,xbmc,$(XBMC_VERSION))
 XBMC_LICENSE = GPLv2
 XBMC_LICENSE_FILES = LICENSE.GPL
 # XBMC needs host-sdl_image (and therefore host-sdl) for a host tools it builds