[patch] Don't load slime-asdf contrib if ASDF is too old

[Luís Oliveira]

Hello,

Loading slime-asdf when ASDF is too old signals an error which will
cause a SLIME connection to be aborted. In order to avoid this, the
attached patch checks the ASDF version before attempting to load
the swank-asdf contrib.

Cheers,
Luís

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