[build] Use *_sol2 GNU ld linker emulations on Solaris 2

[Rainer Orth]

Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> writes:

> Ralf Wildenhues <Ralf.Wildenhues@gmx.de> writes:
>
>> I still can't approve your patch of course.
>
> I think I don't need approval: the configure.ac part only affects
> Solaris 2, so I'll install once 4.5 has branched.

Wrong: since my patch to GNU ld 2.21 removed the previous elf_x86_64
linker emulation, existing GCC releases would be broken if configured
with gld 2.21.  I've therefore installed the patch on mainline and will
backport to the 4.4 branch, too.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University