[PATCH] Optionally use -mlong-double-128 by default on {powerpc{,64},s390{,x},sparc,alpha}-linux (take 3)

[Benjamin Kosnik]

Here is the patch I tested with. 

I think this looks good. I'd be up for putting it into gcc mainline and
the branch. I'm running in to a minor snag with the abi checking, in
that now

acosl@GLIBCXX_3.4.3

instead of 

acosl@@GLIBCXX_3.4.3

This should be fine. I can fix up the testsuites in a bit, when I get on a system where I can debug.

:(

I can verify your testing, at least on powerpc64, with ld 128, and x86/linux (no change).

-benjamin
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