package/tinyxml2: new package

Required for upcoming kodi-pvr-dvblink package:
https://github.com/kodi-pvr/pvr.dvblink/blob/master/CMakeLists.txt#L11



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