[build, lto] Only accept -fuse-linker-plugin if linker supports -plugin (PR lto/46944)

[Rainer Orth]

Paolo Bonzini <bonzini@gnu.org> writes:

>> Paolo, do you have any comments on the configure.ac part of the patch?
>
> It's okay.

Thanks, installed on mainline then.

> I hope Binutils will never switch to 3.x, but that's not your fault.

True: although there are some precautions for binutils > 2, I doubt they
are consistent.  Only if we could deprecate all binutils 2.x releases,
the GCC configure could be considerably simplified.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University