package/tvheadend: Needs python2 host package

Fixes
http://autobuild.buildroot.net/results/3aa/3aaa28eb4fd04a5b578c5128b57ce89165e473be/
http://autobuild.buildroot.net/results/467/467df0fde737de0ec89fe023b2ce33546543d335/
http://autobuild.buildroot.net/results/f5a/f5aa44e0a96820fb8edd47e8096131b68f64f6a7/

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

package/tvheadend/tvheadend.mk

@@ -42,7 +42,7 @@ define TVHEADEND_CONFIGURE_CMDS
 	 --prefix=/usr				\
 	 --arch="$(ARCH)"			\
 	 --cpu="$(BR2_GCC_TARGET_CPU)"		\
-	 --python="$(HOST_DIR)/usr/bin/python"	\
+	 --python="$(HOST_DIR)/usr/bin/python2"	\
 	 --disable-dvbscan			\
 	 --enable-bundle			\
 	 --disable-libffmpeg_static		\