openbsd port

- remove multiple definition of stack_t
- make types resolv correctly
- correct target definitions
  - dragonfly is already defined as freebsdlike
  - bitrig is an openbsdlike
- imports should be public

src/unix/bsd/mod.rs

@@ -149,7 +149,7 @@ cfg_if! {
         mod apple;
         pub use self::apple::*;
     } else if #[cfg(any(target_os = "openbsd", target_os = "netbsd",
-                        target_os = "dragonfly"))] {
+                        target_os = "bitrig"))] {
         mod openbsdlike;
         pub use self::openbsdlike::*;
     } else if #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))] {

src/unix/bsd/openbsdlike/bitrig.rs

@@ -1,16 +1,16 @@
 s! {
     pub struct glob_t {
-        pub gl_pathc:  c_int,
-        pub gl_matchc: c_int,
-        pub gl_offs:   c_int,
-        pub gl_flags:  c_int,
-        pub gl_pathv:  *mut *mut c_char,
-        __unused1: *mut c_void,
-        __unused2: *mut c_void,
-        __unused3: *mut c_void,
-        __unused4: *mut c_void,
-        __unused5: *mut c_void,
-        __unused6: *mut c_void,
-        __unused7: *mut c_void,
+        pub gl_pathc:  ::c_int,
+        pub gl_matchc: ::c_int,
+        pub gl_offs:   ::c_int,
+        pub gl_flags:  ::c_int,
+        pub gl_pathv:  *mut *mut ::c_char,
+        __unused1: *mut ::c_void,
+        __unused2: *mut ::c_void,
+        __unused3: *mut ::c_void,
+        __unused4: *mut ::c_void,
+        __unused5: *mut ::c_void,
+        __unused6: *mut ::c_void,
+        __unused7: *mut ::c_void,
     }
 }