[CMake] Debug support for MS Free Toolkit 2003

[jecxz]

Hi,
some of the documentation says there is no debug support available for 
the Microsoft Free C++ Toolkit (2003), however I have used the toolkit 
for some time and have built wxWidget and other projects with debug 
information and debugged them using Microsoft's Windbg with fair success.

While windbg is not as pretty as the Visual Studio IDE and lacks a few 
things, it certainly works well enough to be useful, with some getting 
used to, no doubt, but the price is right for me. :-)