[slime] swank-loader could use ASDF (#65)

[Attila Lendvai]

FTR, i have these two patches in my slime for years and haven't
experienced any issues (although i never use slime without ASDF):

extend the asdf contrib with an asdf system definition search function
that finds swank, so that (asdf:load-op :swank) or dependence on it
works as expected.

https://github.com/attila-lendvai/slime/commit/9ae8a00b2df95d01b0fa3f60f5ada5b09fe671ec

;; If ASDF is available then store Slime's fasl's where ASDF stores them.
https://github.com/attila-lendvai/slime/commit/f95a4b6f0d0b412ac5eb87cf5b3e4e20e06ae6c1

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• attila lendvai
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