#4865 Some elementary integrals not solved by risch

[David Scherfgen]

Spotted by Claude:

(%i1) risch((1 + 1/x + 1/x^2)*%e^(-1/x), x);
(%o1) %e^-(1/x)*x+'integrate(%e^-(1/x)/x^2,x)

(%i2) risch((2 + 2/x^2 + 5/x^3)*%e^(-1/(2*x^2)), x);
(%o2) 2*%e^-(1/(2*x^2))*x+5*'integrate(%e^-(1/(2*x^2))/x^3,x)

Both have elementary antiderivatives.
sinint can solve them, but it uses gamma_incomplete.
Fix coming.

[David Scherfgen]

Fixed by commit [f9fb24].