[v3] Handle different versions of Solaris 8 <iso/math_iso.h>, <iso/stdlib_iso.h>

[Rainer Orth]

Hi Paolo,

>> Ok for mainline if bootstraps pass?
> Not a comment strictly about this patch, but why we have things like #if
> __cplusplus >= 199711L anywhere? For sure the library is not supposed to be
> used together with old C++ front-ends.

I thought about this myself, but at least the overloads are only present
with __cplusplus >= 199711L.  I think it's best to match this to avoid
strange problems if a user plays strange games with __cplusplus.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University