"Last minute" fix for libstdc++/20806

[Paolo Carlini]

Hi everyone,

the below is what I have regtested, to be safe, on x86-linux. This
approach is reported to fix the problem on mingw32. Generally, I
consider the patch very safe on anything != mingw32 and would take the
risk of applying it very close to the release of 4.0, if the mingw32
maintainer approves its specific bits.

A few observations:
1- If we really want it, we must be *very* quick: a complete code freeze
for 4.0 is scheduled this week-end.
2- I'm not sure whether __CYGWIN__ should be also taken care elsewhere,
besides the newlib config.
3- In any case, I will *not* be able to commit patches during most of
next week: therefore, in case the release manager allows a late commit,
someone else will have to do it (Benjamin? Thanks in advance, in case)

Paolo.

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