ZVBI: fix ISO 639-2/T definitions for slk and ces

Close #8595

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
SD udev: add includes for open()
zvbi: Fix ISO 639-2 definitions for Serbo-Croatian language

Fix typo ssc -> scc (ssc was never ISO 639-2 definition for
Serbo-Croatian language, or any other language for that matter).

Unfortunately, some providers are still using this deprecated ISO
codes (scc/scr) to mark serbian/croatian teletext/cc content.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>