This adds the necessary guards and includes for the Android modules.
While the module does not compile currently due to nullability
differences (and in some cases missing declarations), this at least
brings the module to a point where we can start working on the errors
and differences to create a maintainable codebase for Android.
We would previously conditionally call `GetFullPathNameW` and do string
manipulations for normalising the path. Instead, always call
`GetFullPathNameW` to normalise the path as per Windows' rules. This
more importantly will collapse runs of the arc separator, which is
crucial when using extended paths as the NT path form must always use
the normalised paths or the access will fail.
