[plt-scheme] plt scheme on x86_64/amd64

On Mar 22, Matthew Flatt wrote:
> > setup-plt: Error during Early Install for Plot library
> 
> Probably the same as the SSL problem, so let's try to fix that one
> first.

(This is also going through the foreign interface, but the C code
itself comes from several places that might not compile properly on 64
bit platforms.)

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          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
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