[Bug go/89598] [9 Regression] go frontend fails to build against mpfr 2.4.2

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89598

--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Ian Lance Taylor from comment #5)
> This time for sure.

Indeed: r269411 did fix the build against mpfr 2.4.2 for my test config.

Thanks.