missing value ICANON and TCSANOW for nuttx targets #5639

error[: cannot find value `ICANON` in crate `libc`
    ╭▸ src/util.rs:214:32
    │
214 │         new.c_lflag &= !(libc::ICANON | libc::ECHO);
    ╰╴                               ━━━━━━ not found in `libc`
error[: cannot find value `ECHO` in crate `libc`
    ╭▸ src/util.rs:214:47
    │
214 │         new.c_lflag &= !(libc::ICANON | libc::ECHO);
    ╰╴                                              ━━━━ not found in `libc`
error[: cannot find value `TCSANOW` in crate `libc`
    ╭▸ src/util.rs:215:35
    │
215 │         libc::tcsetattr(fd, libc::TCSANOW, &new);
    ╰╴                                  ━━━━━━━ not found in `libc`
error[: cannot find value `TCSANOW` in crate `libc`
    ╭▸ src/util.rs:222:35
    │
222 │         libc::tcsetattr(fd, libc::TCSANOW, old.as_ptr());
    ╰╴                                  ━━━━━━━ not found in `libc`
For more information about this error, try `rustc --explain E0425`.
error: could not compile `img` (bin "img") due to 4 previous errors