#427 Solve wrong with irreducible polydecomp

[Stavros Macrakis]

poly: x^5+x-3$
polypoly: subst(d2,x,d2);
=> (x^5+x-3)^5+x^5+x-6

solve(polypoly,x)
=> [0 = -x^5+15*x^4-90*x^3+270*x^2-406*x+249]

This is incorrect. It is specifying the solutions of the
outer composed polynomial (polydecomp), not the
composition as a whole -- that said, I don't think there
is any notation in Maxima for specifying the composition
of implicit solutions.

Maxima 5.9.0 gcl 2.5.0

[Robert Dodier]

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Same behavior in 5.9.3cvs.