wget2 | Add --background support for Windows (!464)

[Suhas K S]

Suhas K S created a merge request: 
https://gitlab.com/gnuwget/wget2/merge_requests/464

Project:Branches: suhasks123/wget2:WIN32backgroundSupport to 
gnuwget/wget2:master
Author:    Suhas K S



### Design:

`--background` for non-windows operating systems is implemented using `fork()`. 
Windows doesn't have `fork()` so a workaround needs to be followed to implement 
`--background` on it. The `src/mswindows.c` in wget1.x has a reliable method to 
achieve this.

Essentially, `CreateProcess()` in windows can be used to create a new wget2 
process with the same command line parameters(except `--background`) used to 
run the current running wget2 process. The new process is run without a console 
and suspended till the current running wget2 process is terminated. The console 
output is printed into a file `wget-log` in the same directory.

### Approver's checklist:

* [ ] The author has submitted the FSF Copyright Assignment and is listed in 
AUTHORS
* [ ] There is a test suite reasonably covering new functionality or 
modifications
* [ ] Function naming, parameters, return values, types, etc., are consistent 
with existing code
* [ ] This feature/change has adequate documentation added (if appropriate)
* [ ] No obvious mistakes / misspelling in the code

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