package/kodi-pvr-stalker: needs libxml2

Since
https://git.buildroot.net/buildroot/commit/package/kodi?id=bf9bfd065ba3fab328fd041ca040f2bf134fecf2
kodi itself does not depend on libxml2 anymore which previously
provided libxml2 still needed by kodi-pvr-stalker:
https://github.com/kodi-pvr/pvr.stalker/blob/Krypton/CMakeLists.txt#L12

Fixes a build error not caught by autobuilders because they do not have
host jdk installed:
CMake Error at /usr/share/cmake-3.7/Modules/FindPackageHandleStandardArgs.cmake:138 (message):
  Could NOT find LibXml2 (missing: LIBXML2_LIBRARIES LIBXML2_INCLUDE_DIR)

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/kodi-pvr-stalker/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_KODI_PVR_STALKER
 	bool "kodi-pvr-stalker"
 	select BR2_PACKAGE_JSONCPP
 	select BR2_PACKAGE_KODI_PLATFORM
+	select BR2_PACKAGE_LIBXML2
 	help
 	  A PVR Client that connects Kodi to Stalker Middleware
 

package/kodi-pvr-stalker/kodi-pvr-stalker.mk

@@ -10,6 +10,6 @@ KODI_PVR_STALKER_VERSION = 2.8.6-Krypton
 KODI_PVR_STALKER_SITE = $(call github,kodi-pvr,pvr.stalker,$(KODI_PVR_STALKER_VERSION))
 KODI_PVR_STALKER_LICENSE = GPL-2.0+
 KODI_PVR_STALKER_LICENSE_FILES = src/client.h
-KODI_PVR_STALKER_DEPENDENCIES = jsoncpp kodi-platform
+KODI_PVR_STALKER_DEPENDENCIES = jsoncpp kodi-platform libxml2
 
 $(eval $(cmake-package))