__strtoll, __strtoull and _GLIBCPP_USE_LONG_LONG under hppa64-hpux

[Steve Ellcey]

I tested the patch with the hppa64 target and it works OK for me.  Feel
free to copy it over to the branch.

Steve Ellcey
sje@cup.hp.com

> Since your patch only affects your port and you obvious know best how
> to tweak settings, I can find no reason to reject it. ;-)
> 
> Applied to mainline, please confirm that it works there and then
> I will transfer to the release branch for you:
> 
> -j1.8 -j1.9 libstdc++-v3/config/os/hpux/bits/os_defines.h
> 
> Regards,
> Loren