Windows: autoappend `%PROGRAMFILES%\QEMU` etc. to `%PATH%`

[AkihiroSuda]

lima/.github/workflows/test.yml

Line 228 in 4c791f1

$env:PATH = "$pwd\_output\bin;" + 'C:\msys64\usr\bin;' + 'C:\Program Files\QEMU;' + $env:PATH

For ease of setup, the common QEMU (etc.) path should be automatically recognized

[arixmkii]

Need to check. It might be that latest QEMU installer already does this. Or may be I just added this globally in my test VM, because I didn't need these modification in my latest session with my test VM. Also, if this is not the case, should not it then be reported to QEMU upstream and their installer? And QEMU project now has msys2 installation option as a one of recommended ways on Windows https://www.qemu.org/download/#windows which would definitely has different paths.