libpthread shared library version number

[Maxim Sobolev]

Daniel Eischen wrote:
>>  I think more important would be to know
>> the plans regarding the symbol versioning in 7.0-RELEASE; if the
>> plan is to have them versioned, then I think we should sync shlib
>> majors bumping with this change.
> 
> I agree that we should do this at the same time.

So far I fail to see any sensible reason for this. We can bump now and 
turn versioning later when we are ready. Not a big deal.

-Maxim