Docs claim that `ar` is installed by default on Windows

[Molkree]

Docs claim that ar is installed by default on Windows:

Windows has ar and Expand installed by default

However it doesn't seem to be the case (anymore?). I'm on Windows 10 Home 22H2 and it's not on my PATH. As a result, deb and ipk extraction tests fail for me on Windows.
Either docs should be changed with instructions on installing this tool on Windows or another extractor should be used.

Note that these tests pass in CI which just means that this ar tool is included with preinstalled software on GH VMs. A quick test reveals that it's installed with MinGW: C:\ProgramData\Chocolatey\lib\mingw\tools\install\mingw64\x86_64-w64-mingw32\bin\ar.exe.

[terriko]

Yup, I can confirm that it's not currently installed on the systems I checked either. Let's get those docs updated with instructions.