std::call_once without TLS

[Jonathan Wakely]

2009/4/23 Paolo Carlini:
> Jonathan Wakely wrote:
>> No good reason - I haven't built and tested it on the 4.4 branch
>> recently, I'll do that now.
>>
> Excellent ;) Then, barring objections during the next few hours, please
> go ahead for both.

Committed to trunk and 4.4 now.

Sorry for the delay, my net access was unreliable for the past two days.

Jonathan