package/kodi: Add support for libssh

This patch depends on http://patchwork.ozlabs.org/patch/512480/


and adds sftp support to the virtual filesystems supported by Kodi.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>