Build fails with boost v1.62.0

As per Gentoo Linux bug https://bugs.gentoo.org/show_bug.cgi?id=596222

We are currently maintaining a patch for this which would be good to be dropped on future releases of mongodb (once you upgrade your vendor copy of boost for instance !)

The patch to fix this is here : https://596222.bugs.gentoo.org/attachment.cgi?id=450918

Build fails with:

/usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/include/g++-v5/bits/stl_pair.h:227:5: note: template argument deduction/substitution failed:
src/mongo/db/fts/unicode/string.cpp:277:96: note: mismatched types 'const std::pair<_T1, _T2>' and 'mongo::StringData::const_iterator

Unknown macro: {aka const char*}

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