[preliminary patch] Fix build failure with Debian gcc-4.7

[Daniel Schepler]

On Friday, July 06, 2012 11:00:26 PM Daniel Schepler wrote:
> Here's an updated version, which has the redirections abstracted to a
> couple macros.

OK, as it turned out, that patch completely broke the static build.  Here's a 
completed first draft of the patch, with which I can build amd64 glibc on 
Debian.  (It also builds i386 glibc with no changes, since it seems on that 
arch, __isnan isn't aliased to __GI___isnan or anything else.)
-- 
Daniel Schepler
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