move Dl_info struct per system

- under openbsd and bitrig: dli_saddr member is *mut ::c_void
- under netbsd: it is *const ::c_void

src/unix/bsd/openbsdlike/bitrig.rs

@@ -99,6 +99,13 @@ s! {
         pub si_errno: ::c_int,
         pub si_addr: *mut ::c_void
     }
+
+    pub struct Dl_info {
+        pub dli_fname: *const ::c_char,
+        pub dli_fbase: *mut ::c_void,
+        pub dli_sname: *const ::c_char,
+        pub dli_saddr: *mut ::c_void,
+    }
 }
 
 pub const O_CLOEXEC: ::c_int = 0x10000;

src/unix/bsd/openbsdlike/mod.rs

@@ -24,13 +24,6 @@ s! {
         pub ss_flags: ::c_int,
     }
 
-    pub struct Dl_info {
-        pub dli_fname: *const ::c_char,
-        pub dli_fbase: *mut ::c_void,
-        pub dli_sname: *const ::c_char,
-        pub dli_saddr: *const ::c_void,
-    }
-
     pub struct sockaddr_in {
         pub sin_len: u8,
         pub sin_family: ::sa_family_t,

src/unix/bsd/openbsdlike/netbsd.rs

@@ -182,6 +182,13 @@ s! {
         pub dqb_btime: ::int32_t,
         pub dqb_itime: ::int32_t,
     }
+
+    pub struct Dl_info {
+        pub dli_fname: *const ::c_char,
+        pub dli_fbase: *mut ::c_void,
+        pub dli_sname: *const ::c_char,
+        pub dli_saddr: *const ::c_void,
+    }
 }
 
 pub const O_CLOEXEC: ::c_int = 0x400000;

src/unix/bsd/openbsdlike/openbsd.rs

@@ -102,6 +102,13 @@ s! {
         pub si_addr: *mut ::c_void,
         __pad: [u8; 116],
     }
+
+    pub struct Dl_info {
+        pub dli_fname: *const ::c_char,
+        pub dli_fbase: *mut ::c_void,
+        pub dli_sname: *const ::c_char,
+        pub dli_saddr: *mut ::c_void,
+    }
 }
 
 pub const O_CLOEXEC: ::c_int = 0x10000;