Fix "conflicting types for built-in function" warnings from nldbl-*.c

[David Miller]

From: "Joseph S. Myers" <joseph@codesourcery.com>
Date: Tue, 4 Dec 2012 15:46:31 +0000

> Building for powerpc32, and probably other systems using ldbl-opt
> (i.e. supporting -mlong-double-64, now defaulting to
> -mlong-double-128, where a previous version only supported
> -mlong-double-64), produces many "conflicting types for built-in
> function" warnings building the nldbl-*.c compatibility functions for
> code using -mlong-double-64 (the code is using the type "double" in
> defining the versions of the long double functions that just wrap the
> functions for double).  This patch fixes this by using the appropriate
> -fno-builtin-<function> option or options for each affected source
> file, to disable the conflicting built-in declaration.
> 
> (There are still quite a few warnings left for powerpc32 after this
> patch ... I hope the architecture maintainers will also look at them
> for 2.17, and that they will look at cleaning up warnings for
> powerpc64 as well.)

I see the same warnings on 32-bit Sparc, as you had guessed.

I'm fine with this change.