Rollup merge of #22792 - semarie:openbsd-unbreak-nacl, r=alexcrichton

Rollup merge of #22792 - semarie:openbsd-unbreak-nacl, r=alexcrichton

 The recent commit on liblibc for nacl break the compilation for OpenBSD (and Bitrig too, I think).

The problem is `ino_t` come from another block too now. This patch remove the extra declaration.

```
.../src/liblibc/lib.rs:98:9: 98:37 error: a type named `ino_t` has already been imported in this module [E0251]
.../src/liblibc/lib.rs:98 pub use types::os::arch::posix01::*;
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: aborting due to previous error
```

@dhuseby do you have this problem too ? and if yes, does this patch correct it ?