Windows Support

[loiclec]

I think it is very important that fuzzcheck runs on Windows. Unfortunately, I know nothing about Windows and I don't have a computer to test it.

I expect that there are three parts that need to change to support Windows:

1. the C file that gives pointers to the __llvm_prf_cnts and __llvm_prf_data sections of the executable object (the sections have a different name on Windows, but otherwise I think the file should be roughly the same)
2. the signal handler
3. there may be some problems with Paths

The one that I need the most help with is the signal handling. Please let me know if you are available to help out 😊

Thank you!