MRI compatibility with IO::sysopen for serial ports on windows#5809

Merged

enebo merged 3 commits intojruby:masterfrom

byteit101:winio

Aug 2, 2019

Commits on Jun 27, 2019

Detect and avoid absoluting windows COM ports so IO::sysopen("com1", File::RDWR) works on windows
byteit101
committed

Commits on Jun 28, 2019

MRI compatibility with sysopen and fileno on windows returning the c handle instead of fake handles.
byteit101
committed

Commits on Aug 1, 2019

Don't create the win c library reference if we aren't doing native IO as per review
byteit101
committed