package/kodi-pvr-stalker: Needs jsoncpp

Fixes
http://autobuild.buildroot.net/results/56f/56fb98da27495f6a461bfdc7aa8c2de4d86dfdb8/
http://autobuild.buildroot.net/results/f98/f982b437935cf1f921559f5388fd4146eb9241bd/



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>