Primary methods on SOCKET and DUAL-CHANNEL-GRAY-STREAM were preventing
the one on FUNDAMENTAL-STREAM from being executed, so I removed them
and reworked the other :AROUND methods a little bit.

Thanks to Daniel Rebelo de Oliveira for reporting this bug.

Nikodemus Siivola authored Oct 15, 2010 and Stelian Ionescu committed Oct 15, 2010

As of recently Alexandria package is locked on SBCL, which prohibits
local function bindings (unless implementation-specific declarations
are used)