unbreak dragonfly build after nacl integration

this is the same problem as openbsd (rust-lang#22792).

without the patch, liblibc don't build.

Author: semarie

src/liblibc/lib.rs

@@ -1115,7 +1115,6 @@ pub mod types {
             pub mod posix88 {
                 pub type off_t = i64;
                 pub type dev_t = u32;
-                pub type ino_t = u32;
                 pub type pid_t = i32;
                 pub type uid_t = u32;
                 pub type gid_t = u32;