Fix concept checks usage

[Jonathan Wakely]

On 15/12/16 21:45 +0100, François Dumont wrote:
>Hi
>
>Here is a fix in the usage of a concept check. There are also many 
>testsuite failures when using concept checks but this one forbids the 
>library from being built. I know that concept checks are not really 
>maintained so maybe the fix is to simply remove those checks.
>
>
>    * include/ext/random.tcc: Fix usage of _OutputIteratorConcept.
>
>Tested under Linux x86 with and without concept checks.
>
>Ok to commit ?

OK, thanks.