the Makefile now automatically detects if MSVC supports OpenMP 3.0 or later
the Makefile now automatically detects if MSVC supports OpenMP 3.0 or later

anatoliyrazin/primesieve,fredwang00/primesieve,tempbottle/primesieve,fredwang00/primesieve,ZahidDev/primesieve,anatoliyrazin/primesieve,anatoliyrazin/primesieve,ZahidDev/primesieve,kimwalisch/primesieve,tempbottle/primesieve,kimwalisch/primesieve,tempbottle/primesieve,fredwang00/primesieve,kimwalisch/primesieve,ZahidDev/primesieve