DJGPP Build broken for DOS host machine

[ElTentakel]

-With this Changes #98 SBEMU could not build anymore using the DOS DJGPP Toolchain, because the target for the als4000.o could not be found.

Since the makefile.dos has not changed in this merge, I assume, that the makefile is not updated regarding the ported Linux drivers.

To fix this issue, i tried to apply the changes from makefile, but unfortunately some bash commands are used to create the proper output directories.

[ElTentakel]

I just applied the changes from the linux makefile and created the directories myself and it works. Unfortunately I have no Idea how to create sub-sub directories with md (like mkdir -p C:\SBEMU\output\drivers), since this is not supported by the original DOS command. Maybe the directories could be created with a separate batch file.

[ElTentakel]

I've created a pull request:

main...ElTentakel:SBEMU:patch-1