[issue22591] Drop support of MS-DOS

[STINNER Victor]

STINNER Victor added the comment:

> AFAIK Borland and Watcom compilers supported Windows.

It looks like Borland C++ Builder 5.5 was released in 2000, 14 years ago. Yes, it supports Windows and MS-DOS, but do we really want to support this very old proprietary compiler?

For Watcom, it's a different story. The compiler was released under an open source license. It's now hosted at github and the project is actively developed (last commit a few hours ago):
https://github.com/open-watcom/open-watcom-v2/

It would be interesting to support OpenWatcom compiler on Windows to not depend on the proprietary Microsoft compiler.

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