Fix of the adaption to Windows

[Thomas008]

Thank you for incorporating the pull request. There is still one line that causes that StaticCompiler does not work in Windows:

in generate_executable():

The line ``cmd \c clang is wrong.

It must be: ``cmd /c clang

(I tried to do a pull request with the fix But when forking the code in StaticCompiler.jl differed from the one in the curent package ?!)