Fix "using Windows PHP in Cygwin"-check in shim script

[HoldYourWaffle]

Fixes #153.

This check was introduced in ae29413, but as far as I can tell "Cygwin PHP" understands Windows-style paths just fine, so the extra "Windows PHP"-check could be removed.

Supersedes #154, apparently GitHub trips if you rename a branch...

[johnstevenson]

Thanks, but this breaks Cygwin PHP. Did you test it?

[HoldYourWaffle]

I did, like I mentioned as far as I can tell "Cygwin PHP" understands Windows-style paths just fine.

However, I just noticed that Using Cygwin - Using native Win32 paths advises against relying on this behavior, so I'll see if I can find an even better way to do this :)

[HoldYourWaffle]

@johnstevenson Found a better way!

If the Windows-translated root path (C:\cygwin64) is a prefix of the Windows-translated PHP path (C:\tools\php82\php for Windows, C:\cygwin64\usr\bin\php for Cygwin), then we're using a Cygwin binary and need to translate the path.

It feels a teeny tiny bit janky, but it seems to be impossible to consistently resolve mounted paths to their cygdrive equivalent.

[johnstevenson]

Thanks, this looks like a good way of doing it

[HoldYourWaffle]

@johnstevenson Fixed!
I remember starting out with -m and it not working, but it seems to work now, very strange...

[johnstevenson]

Thanks for this.