Add Rice distribution to libstdc++

[Paolo Carlini]

On 09/16/2012 10:02 PM, Marc Glisse wrote:
> On Sun, 16 Sep 2012, Ed Smith-Rowland wrote:
>
>> This adds the Rice distribution to the C++11 <random> facility and a 
>> Gnu extension.
>
> Hello,
>
> libstdc++ not in copy?
>
> The change to beta_distribution is not mentioned in the ChangeLog.
>
> You don't appear to have a test like those added for PR 54376, and 
> like Ulrich I find the operator== suspicious.
Indeed, please fix that, I thought it was clear by now: no inline 
template friends.

Thanks,
Paolo.