minidlna: add allow wide links option

minidlna: add allow wide links option

Some users might create a minidlna root with symlinks
to shared locations. While this could potentially create
a vulnerability, the option should be available to allow
users to do this should they choose to.

wide_links=no : (default) no content served + error message
 [timestamp] upnphttp.c:1366: error: Rejecting wide link X

wide_links=yes : content served, no error messages

Signed-off-by: James Christopher Adduono <jc@adduono.com>