PATCH: eliminate more warnings

[Ian Lance Taylor]

Ben Elliston <bje@au1.ibm.com> writes:

> 2008-12-18  Ben Elliston  <bje@au.ibm.com>
>
>         * config/fp-bit.h (pack_d): Constify argument.
>         * config/fp-bit.c (makenan): Constify return type. Remove casts.
>         (isnan): Constify argument.
>         (isinf): Likewise.
>         (iszero): Likewise.
>         (pack_d): Likewise.
>         (_fpadd_parts): Constify return type.
>         (_fpmul_parts): Likewise.
>         (_fpdiv_parts): Likewise.

The patches to fp-bit.[ch] are OK.

Thanks.

Ian