[LTO] Build libiberty with --enable-shared if gold+lto are enabled

[Paolo Bonzini]

On 09/29/2009 10:45 PM, Diego Novillo wrote:
> This patch from Ian removes the last libiberty modification.  We
> only need to build an -fPIC variant of libiberty if gold is
> enabled.
>
> Tested on x86_64 with and without gold support.

Ok for trunk too.

Paolo