[COMMITTED PATCH] Add missing #include in get-rounding-mode.h

[Paul Eggert]

On 06/24/2014 01:35 PM, Joseph S. Myers wrote:
> I hope we can move to building with
> -Werror by default (with some suitable policy about using
> -Wno-error=whatever or -Wno-whatever

To do that, I suggest taking a look at Gnulib's manywarnings module, 
which lets the maintainer tailor the warnings desired, and which 
arranges for 'configure' to check for the warnings that actually work 
with the compiler version being used to build.