feature/fix build script

[g0nz4I0]

Fixed CMake error on post build on Windows and removed absolute path for nosys.specs file, also Windows build is now supported

[AmancioG]

You can use:

   import os
   path = os.path.join(arg1, arg2, arg3, ... )

and writting the path in the arguments, you will get the OS default direcotry separator automatically. For example:

    path = os.path.join("folder1", "folder2", "forlder3", "file")

The path, on posix systems, will be:
"folder/folder2/folder3/file"

and on Windows, it will instead be:
"folder\folder2\folder3\file"

[g0nz4I0]

Addressed, this would have made it much easier from the beginning: I don't know why I didn't use it :(

[g0nz4I0]

Test slack bot

[ricardochust]

it works on my machine 👍