Added LIBUDEV_196 symbol versioning

systemd-udev-196 added four more functions to their libudev.sym under
the LIBUDEV_196 version; consumers such as udisks use the symbol versions
at link time and so it is absolutely necessary for us to provide the same
symbol versioning and functions in order to provide compatibility.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>