[PATCH] Add configure flag to enable gnu hash style by default.

[Alan Modra]

On Tue, Jul 18, 2017 at 05:19:36PM +0000, Romain Geissler wrote:
> Hi,
> 
> This is the second version of my hash style changes.
> 
> Changes since v1:
>  - use --enable-default-hash-style rather than --with-default-hash-style
>  - the default value is now "both" rather than "gnu"

Changing to "gnu" or "both" by default will be bad for non-GNU
systems.  I think you need to make the default conditional on target.

Also, this change needs testing on more than just x86_64-linux.

-- 
Alan Modra
Australia Development Lab, IBM