libpthread version bump

[Scott Long]

Warner Losh wrote:
>>Having lived through the std{io,err,out} libc snafu, the
>>libm.so.2 snafu, and now the libc.so.5/libpthread.so.1
>>problem, I will once again suggest that *ALL* library
>>version numbers should be bumped when a new branch is
>>created.
> 
> 
> Yes.  When a library version is bumped, *ALL* libraries that depend on
> it need to be bumped.  Sadly, this has proven to be too difficult
> because it would create an unholy maintanence problem for the ports.
> 
> Warner

Well, there is indeed a problem at the moment of libc being bumped for
6-current but not libpthread.  However, I think that the particular
problem with the fs/gs change goes above and beyond this problem.  So,
we have about 2 months to sort this all out.  Any volunteers?

Scott