wasm: make ls pass and prepare more work

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tty/tty-eof (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/rm/isatty (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/csplit/csplit-heap is now passing!
Congrats! The gnu test tests/tail/tail-n0f is now passing!
Note: The gnu test tests/env/env-signal-handler was skipped on 'main' but is now failing.

[cakebaker]

What's the reason for introducing a new feature instead of using #[cfg(target_os = "wasi")] like in the other files?

[sylvestre]

no good reason, updated!

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/cut/bounded-memory (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)

[sylvestre]

@cakebaker actually, because of this:

   Compiling hostname v0.4.2
error: Unsupported target OS! Create an issue: https://github.com/djc/hostname/issues/new
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hostname-0.4.2/src/lib.rs:67:9
   |
67 |         compile_error!("Unsupported target OS! Create an issue: https://github.com/djc/hostname/issues/new");
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0433]: failed to resolve: use of unresolved module or unlinked crate `sys`
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hostname-0.4.2/src/lib.rs:88:5
   |
88 |     sys::get()
   |     ^^^ use of unresolved module or unlinked crate `sys`
   |
   = help: if you wanted to use a crate named `sys`, use `cargo add sys` to add it to your `Cargo.toml`

[cakebaker]

Hm, maybe you can gate the hostname dependency with [target.'cfg(not(target_os = "wasi"))'.dependencies] in ls/Cargo.toml?

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tty/tty-eof (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/resolution (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/follow-name (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/dd/no-allocate is now being skipped but was previously passing.