[boost] Patch for building Boost with GCC 4.4.0

From: Chris Fairles (chris.fairles_at_[hidden])
Date: 2008-06-18 08:51:10

GCC changed the way #elif's are handled (is now more std-compliant
apparently) but this broke all the #elif BOOST_PP_ITERATION_DEPTH() ==
N lines. They need to be replaced with

#elif defined(BOOST_PP_ITERATION_DEPTH)
#if BOOST_PP_ITERATION_DEPTH == N
...
#endif

Attached is a patch that does so (against trunk).

Cheers,
Chris