[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Add accurate check for console stdio + add associated primitive (#254)

[Eliot Miranda]

Hi Alistair,

    I agree we shouldn't include cygwin1.dll.  But the existence of cygwin1.dll is proof that the relevant code can be implemented above Win32.  I do know that one can read from cygwin terminals; I was doing that regularly with the old VM.  So the issue is simply identifying a cygwin console as a tty.  We can put reading/writing from/to it to one side and first focus on identification.  I'm happy for you to extend primitiveIsFileDescriptorATTY as you suggest.  What I think we need, though, is to be able to identify either a Windows console or a cygwin console independently of cygwin1.dll (even if we have to copy some liberally licensed code from it).

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