fix libquadmath build regression

[Alexandre Oliva]

On Dec 24, 2012, Paolo Bonzini <bonzini@gnu.org> wrote:

> Il 21/12/2012 06:17, Alexandre Oliva ha scritto:
>> The problem is that glibc has an extern inline definition of
>> fraiseexcept that is introduced by including fenv.h (it's in
>> bits/fenv.h), and this definition requires SSE support regardless of
>> target arch of word width, so it doesn't work for an i686 native that
>> doesn't assume SSE registers and instructions are available.
>> 
>> This bug is fixed in newer versions of glibc, but I figured it wouldn't
>> hurt to have a work-around in place for libquadmath to build

> Would it be possible to fix it in fixincludes instead?

Heh, who'd have thought of using fixincludes to fix broken include
files? :-)  (hint: not me :-)  *blush*

Thanks for the suggestion, this patch fixes the problem.  Regstrapped on
x86_64-linux-gnu and i686-linux-gnu.  Ok to install?

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