[Ecls-list] Bug fix for Slime C-c C-k in Windows

[Dustin Long]

Hello,
I noticed that with Slime/ECL on Windows, slime-compile-and-load-file 
(C-c C-k) has no effect after being used once. The reason seems to be 
that ECL uses dll's for fasl, and in Windows once a library is loaded it 
cannot be written to.

I came up with a fix that has two parts. One, whenever compile-file is 
called in Windows to create a fasl, if the .fas exists and is loaded, it 
is moved to the temporary directory (since loaded libraries can be 
moved, but not modified). Then, when a .fas gets loaded, if it was 
already loaded it is closed first (since loading an already loaded 
library will just return the old handle, even if the dll was changed).

Patch is attached.
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