dd: support wasm-wasip1

[oech3]

I don't see any reason that it does not making a sense.

[xtqqczze]

error[E0425]: cannot find value `LC_CTYPE` in crate `libc`
  --> src/uu/dd/src/conversion_tables.rs:20:36
   |
20 |     unsafe { libc::setlocale(libc::LC_CTYPE, c"".as_ptr()) };
   |                                    ^^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LC_CTYPE` in crate `libc`
  --> src/uu/dd/src/conversion_tables.rs:37:36
   |
37 |     unsafe { libc::setlocale(libc::LC_CTYPE, c"".as_ptr()) };
   |                                    ^^^^^^^^ not found in `libc`

error[E0599]: no method named `as_handle` found for struct `std::io::Stdin` in the current scope
   --> src/uu/dd/src/dd.rs:364:44
    |
364 |             let f = File::from(io::stdin().as_handle().try_clone_to_owned()?);
    |                                            ^^^^^^^^^
    |
help: there is a method `as_fd` with a similar name
    |
364 -             let f = File::from(io::stdin().as_handle().try_clone_to_owned()?);
364 +             let f = File::from(io::stdin().as_fd().try_clone_to_owned()?);
    |

error[E0599]: no method named `creation_time` found for struct `std::fs::Metadata` in the current scope
   --> src/uu/dd/src/dd.rs:371:26
    |
371 |                 metadata.creation_time() != 0
    |                          ^^^^^^^^^^^^^ method not found in `std::fs::Metadata`

[xtqqczze]

Do we support officially support wasi, would it OK to require a nightly compiler, see #12258 (comment)

[oech3]

We already have many *.wasi buildable with stable. So strong dep on nightly is not an option.