[PATCH 1/2] BZ#10375: Configure magic to use -U_FORTIFY_SOURCE if needed.

[Nix]

On 8 May 2012, Roland McGrath uttered the following:
> It is my considered professional opinion as an expert in the field
> that the hacking of the compiler to default to -D_FORTIFY_SOURCE
> and -fstack-protector is silly.

Maybeso, but my compile-glibc-with-fstack-protector patch (which I shall
reroll soon to exclude the change to __stack_chk_fail itself, honest)
*did* manage to find a genuine glibc bug. :)

-- 
NULL && (void)