[doc, testsuite, libgfortran] Avoid use of SSE/SSE2/SSE3 on Solaris 8/9 x86

[Rainer Orth]

"H.J. Lu" <hjl.tools@gmail.com> writes:

> If you put this knowledge somewhere in gcc, you can use it to check SSE
> support. That is "gcc -msse2" should fail to compile if SSE2 isn''t supported
> by target OS.

I don't think this makes sense: by the same logic, gcc would forbid to
create 64-bit code if the system running the compiler isn't capable of
executing the resulting code.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University