[boost] BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END in wrong place

In boost/mpl/if.hpp the BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN macro is inside a test for BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION, but the corresponding BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END is after the #endif that matches the test. This doesn't cause an error, since those macros only expand to anything meaningful for GCC3, which enters the first branch of the #if, so the begin/end macros are balanced - but it ain't right. Bug was found due to an error with missing #endif, which made GCC3 take a different path through that file and error. Note also those macros are spelled "AGLORITHM" not ALGORITHM. Untested patch attached. jon -- "Faith strikes me as intellectual laziness." - Robert Heinlein