C++17 build errors

[dslarm]

On OS/X, latest C++ compilers, and latest Clang, will error (see conda-forge/coinmp-feedstock#11) due to use of deprecated 'register' and 'std::bind2nd'. These were removed from C++17, and deprecated in C++17.

The Makefile for CoinMP needs to either add '-std=c++14' - or the code be updated to c++17.