Jiri Malak authored May 01, 2020 and Brad King committed May 06, 2020

DOS 16-bit and 32-bit target support files for cross-compilation by
OpenWatcom.

It is used if CMAKE_SYSTEM_NAME=DOS is defined.

If CMAKE_SYSTEM_PROCESSOR=I86 is defined then 16-bit DOS target is used,
otherwise 32-bit DOS target is used.