Solaris ENOATTR build failure

[jperkin]

The commit 0d637ae switches to ENOATTR in preference to ENODATA, however this causes the build to fail on Solaris which does not provide ENOATTR. I assume the same will be true of all unsupported platforms.

error[E0432]: unresolved import `libc::ENOATTR`
 --> vendor/xattr/src/util.rs:8:20
  |
8 | use libc::{ERANGE, ENOATTR, ssize_t};
  |                    ^^^^^^^ no `ENOATTR` in the root. Did you mean to use `ENOTTY`?

Is the correct fix here to work around it in the module, or add a dummy libc::ENOATTR alias for libc::NODATA to rust?

[Stebalien]

Fixed in #19. Could you test it?

FYI, solaris technically supports extended attributes. Would you like to try adding full support? #19 just makes it compile, it doesn't actually add support.

Here's some code that might get you started:

https://github.com/xattr/xattr/blob/85420e91be287ac9bb5ef2f1ae5e1b34131cc0b1/xattr/lib_build.py#L279-L456

(no pressure 😄)