Use is_terminal to implement isatty #2609
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This means that Linux targets on Windows hosts should give a correct reply. We still don't have an implementation for Windows targets though, that requires some tracking of handles.
Fixes #2419
Also restructure our
fstests a bit to test the parts that don't need libc separately.as_unix_host_fdis now not used any more, but it could become useful again in the future so I kept it.