This sets the database connection character-set to UTF-8
for rdxport.cgi.
Setting the character-set is needed because the XML output
provided by rdxport.cgi is marked to be encoded in UTF-8 and
at least Firefox complains about the XML being not well-formed
when using the default character set for SQL results.

Signed-off-by: Christian Pointner <equinox@helsinki.at>