Recommended update for boost

This update for boost adapts paths for our GCC versions:

- Boost assumes /usr/include/c++/x.y.z/ existence for GCC 4.x onward while our
version of GCC only has /usr/include/c++/x.y for 4.x GCC and /usr/include/c++/x/
for 5.x onward. (bsc#996917)
- Fix regression in asio library. (bsc#925309)
- Add libboost_context to the -devel dependencies when it is built. (bsc#970706)

This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#996917
C++ compilation failure when including boost's boyer_moore.hpp
bnc#925309
libboost: async_connect incorrectly reports success on failure
bnc#970706
boost-devel does not pull libboost_context shlib package
Selected Binaries
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