Feature request: Make it DOS-compatible

[leecher1337]

I'd like to use these tests to validate protected mode functionality. For this, I'd like to have it runnable under MS-DOS. The original work where you derived it from runs fine as a DOS .com file. Can you readd the ability to run it under DOS, maybe as an #ifdef ? Thank you!

[barotto]

I've removed the DOS executable functionality in order to simplify the code and ease development, as doing so allowed me to make assumptions about the memory layout, exception handling, and other things. But I'll look into it.