Add a testcase for fd_filestat_set_*

[marmistrz]

This PR matches CraneStation/wasi-misc-tests#14 and should be merged before #54.
The file was created using cargo build --release --target=wasm32-wasi

(I'm not really sure how I should submit the .wasm files)

[kubkon]

I'm at a loss here. I thought that the whole point was to add a testcase that tests changes of #54 in addition to #47 :-D Anyhow, I suggest we wait with this PR after #54 is merge, or you could potentially add the test binary as part of #54.

[kubkon]

This PR matches CraneStation/wasi-misc-tests#14 and should be merged before #54.
The file was created using cargo build --release --target=wasm32-wasi

(I'm not really sure how I should submit the .wasm files)

I'd personally submit the testcase as part of the PR which introduces a new feature, so in this case, #54. But this way is good provided we merge #54 first and we don't exclude the test from Windows build ;-)

[marmistrz]

The idea was to guarantee that we don't accidentally change the semantics of fd_filestat_set_times. Now we test only #47, we'll enable this test on Windows as a part of #54.

[kubkon]

Ah, that's an excellent point actually the results of which we have witnessed first hand in bytecodealliance/wasmtime#255 ;-)