The hack that works in MINGW does not work with MSVC's CRT. Add MSVC
versions of isatty() and swap_osfhnd().
The MINGW versions attempt to replace the underlying OS HANDLE in an
existing file descriptor (fd) by writing to some undocumented fields in
the "ioinfo" structures inside the CRT. These structures changed size
and shape with the new UCRT in VS2015. The new MSVC versions of these
routines work without touching private fields. In theory, we should be
able to replace the ming versions with
this one.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
042632aed1