python: Compile problems when trying to link to 1.67.0 python library

I decided to give the RC2 a spin and ran into just one issue in my project. We have a DLL which links with the python .lib in windows, and when the MSVC 2017 compiler attempted to parse the library name headers in detail/config.hpp at line 108:

#define BOOST_LIB_NAME boost_python##PY_MAJOR_VERSION##PY_MINOR_VERSION

…it resulted in a linker error looking for boost_pythonPY_MAJOR_VERSIONPY_MINOR_VERSION-vc141-mt-x64-1_67.lib.

I had to modify the header to something like this in order to link properly:

#define _BPYCONCAT(A, B) A ## B
#define BPYCONCAT(A, B) _BPYCONCAT(A, B)
#define BOOST_LIB_NAME BPYCONCAT(boost_python, BPYCONCAT(PY_MAJOR_VERSION, PY_MINOR_VERSION))