getopt_long is not implemented in windows

## Brief feature description

getopt_long is not implemented in windows

## Detailed information

My project needs large buffers, and I followed the configuration document, fill the size it needed, but when I was trying to start iox-roudi.exe with parameter "-c ", it says "getopt_long is not implemented in windows".
I have 2 solutions:
1) Hardcode the size of memory pool in _**roudi_main_static_config.cpp**_
2) Find an open sourced implementation of **_getopt_long_** and put it into the project to build a version which can make -c work.

Since I'd like to give my project more flexibilities, I chose solution 2, and it works well.
I'd like to make a contribution to the project, but **_getopt_long_** is not written by myself, and I don't know the relevant policy of the project, so I have to ask this feature by posting this request.

Thank you.