#927 gcd:eez not implemented

[Raymond Toy]

Setting gcd to eez, which is documented via describe to
be a valid possibility, causes an error when used.
Maxima says eezgcd not implemented.

This is one way to trigger the message:

gcd:eez;
ratsimp(diff(integrate(1/(x^5+1),x),x));

I suggest changing the documentation to remove the
entry for eez.

[Robert Dodier]

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user_id=501686

Cut out refs to unimplemented gcd algorithms $eez and $sphen
in src/rat3c.lisp and doc/info/Polynomials.texi & committed.
Closing this report as fixed.