ds|nntp: use CORE::close on socket

IO::Socket::SSL will try to re-bless back to the original class
on TLS negotiation failure.  Unfortunately, the original class
is 'GLOB', and re-blessing to 'GLOB' takes away all the IO::Handle
methods, because Filehandle/IO are a special case in Perl5.
Anyways, since we already use syswrite() and sysread() as functions
on our socket, we might as well use CORE::close(), as well (and
it plays nicely with tied classes).

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