[v3] Correctly determine baseline_subdir for 64-bit default Solaris gcc

[Rainer Orth]

Hi Paolo,

>> Ok for mainline if that passes?
> I'm going to trust you Rainer on this and it seems very safe on
> x86_64-linux anyway. Please wait just one more day or so and then check it
> in.

ok, will do.  The x86_64-unknown-linux-gnu bootstrap has completed
without regressions and the correct baselines were used for both
multilibs.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University