Revert "geoip-functions.pl: Re-write code to lookup the iso country code of a given...

Revert "geoip-functions.pl: Re-write code to lookup the iso country code of a given IP-address."

Enhanching the code to fix the lookup will rapidely slow down the lookup speed. Because using
the GeoIP2 module is no option ( the reasons have been described in the commit message which will
now reverted), we have decided to temporary switch back to the old module until a nice solution has
been found.

This reverts commit ff21ff90d24de0f648d24bb906c45738b81ce67a.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>