[opus] [libopusfile PATCH] build: implement autotools build system for libopusfile. (v4)

[Timothy B. Terriberry]

Diego Elio Pettenò wrote:
> On 29/09/2012 09:23, Ralph Giles wrote:
>> I think we should use gz or xz. There's no point to bz2 at this point.
>> xz requires Automake 1.11, so this isn't a new dependency here.
>
> If you're okay with xz (mostly I was thinking compatibility), then I'd
> suggest going to xz...

I have no objection to xz, but libopus only distributes in .gz, so I 
think I'll just remove these options to get gzip-only for consistency. 
We can always revisit providing xz (for both libopusfile and libopus) later.

Diego, did you have an opinion on the rest of the changes I made?