msports commit (51813) - CMakeLists.txt references nonexistent files

[Adam]

When I was trying to build trunk (using Cmake) the configure.cmd did not  
complete. Host tools were OK but reactos directory was not.

I tracked the issue to /dll/win32/msports/CMakeLists.txt which contained  
references to two nonexistent files (serial.c and parallel.c) and  
commenting them out allowed the build to continue (albeit with an error at  
the very end)  there.