Changes to support pgi-10.x.
John suggested running configure --enable-test but
even after making suggested changes, it still doesn't
seem to pick up that BOOST_HAS_PTHREADS has been defined.
Also, not sure how to undefine these macros as they seem
to be set after I explicitly undefine them.
the following macros need to be defined
BOOST_HAS_PTHREADS
the following macros need to be undef'ed
BOOST_NO_STDC_NAMESPACE BOOST_NO_EXCEPTION_STD_NAMESPACE BOOST_DEDUCED_TYPENAME