Auto merge of #23967 - semarie:libc-clone, r=alexcrichton

affected struct:
 - sockaddr_storage
 - sockaddr_un

apply the same method used for linux for:
 - bitrig/openbsd
 - freebsd
 - dragonfly

this commit unbreak build for openbsd (and bitrig, freebsd and dragonfly too I think)

r? @alexcrichton

src/liblibc/lib.rs

@@ -863,13 +863,16 @@ pub mod types {
                     pub sa_data: [u8; 14],
                 }
                 #[repr(C)]
-                #[derive(Copy, Clone)] pub struct sockaddr_storage {
+                #[derive(Copy)] pub struct sockaddr_storage {
                     pub ss_len: u8,
                     pub ss_family: sa_family_t,
                     pub __ss_pad1: [u8; 6],
                     pub __ss_align: i64,
                     pub __ss_pad2: [u8; 112],
                 }
+                impl ::core::clone::Clone for sockaddr_storage {
+                    fn clone(&self) -> sockaddr_storage { *self }
+                }
                 #[repr(C)]
                 #[derive(Copy, Clone)] pub struct sockaddr_in {
                     pub sin_len: u8,
@@ -917,11 +920,14 @@ pub mod types {
                     pub ai_next: *mut addrinfo,
                 }
                 #[repr(C)]
-                #[derive(Copy, Clone)] pub struct sockaddr_un {
+                #[derive(Copy)] pub struct sockaddr_un {
                     pub sun_len: u8,
                     pub sun_family: sa_family_t,
                     pub sun_path: [c_char; 104]
                 }
+                impl ::core::clone::Clone for sockaddr_un {
+                    fn clone(&self) -> sockaddr_un { *self }
+                }
                 #[repr(C)]
                 #[derive(Copy, Clone)] pub struct ifaddrs {
                     pub ifa_next: *mut ifaddrs,
@@ -1125,13 +1131,16 @@ pub mod types {
                     pub sa_data: [u8; 14],
                 }
                 #[repr(C)]
-                #[derive(Copy, Clone)] pub struct sockaddr_storage {
+                #[derive(Copy)] pub struct sockaddr_storage {
                     pub ss_len: u8,
                     pub ss_family: sa_family_t,
                     pub __ss_pad1: [u8; 6],
                     pub __ss_align: i64,
                     pub __ss_pad2: [u8; 112],
                 }
+                impl ::core::clone::Clone for sockaddr_storage {
+                    fn clone(&self) -> sockaddr_storage { *self }
+                }
                 #[repr(C)]
                 #[derive(Copy, Clone)] pub struct sockaddr_in {
                     pub sin_len: u8,
@@ -1179,11 +1188,14 @@ pub mod types {
                     pub ai_next: *mut addrinfo,
                 }
                 #[repr(C)]
-                #[derive(Copy, Clone)] pub struct sockaddr_un {
+                #[derive(Copy)] pub struct sockaddr_un {
                     pub sun_len: u8,
                     pub sun_family: sa_family_t,
                     pub sun_path: [c_char; 104]
                 }
+                impl ::core::clone::Clone for sockaddr_un {
+                    fn clone(&self) -> sockaddr_un { *self }
+                }
                 #[repr(C)]
                 #[derive(Copy, Clone)] pub struct ifaddrs {
                     pub ifa_next: *mut ifaddrs,
@@ -1405,13 +1417,16 @@ pub mod types {
                     pub sa_data: [u8; 14],
                 }
                 #[repr(C)]
-                #[derive(Copy, Clone)] pub struct sockaddr_storage {
+                #[derive(Copy)] pub struct sockaddr_storage {
                     pub ss_len: u8,
                     pub ss_family: sa_family_t,
                     pub __ss_pad1: [u8; 6],
                     pub __ss_pad2: i64,
                     pub __ss_pad3: [u8; 240],
                 }
+                impl ::core::clone::Clone for sockaddr_storage {
+                    fn clone(&self) -> sockaddr_storage { *self }
+                }
                 #[repr(C)]
                 #[derive(Copy, Clone)] pub struct sockaddr_in {
                     pub sin_len: u8,
@@ -1459,11 +1474,14 @@ pub mod types {
                     pub ai_next: *mut addrinfo,
                 }
                 #[repr(C)]
-                #[derive(Copy, Clone)] pub struct sockaddr_un {
+                #[derive(Copy)] pub struct sockaddr_un {
                     pub sun_len: u8,
                     pub sun_family: sa_family_t,
                     pub sun_path: [c_char; 104]
                 }
+                impl ::core::clone::Clone for sockaddr_un {
+                    fn clone(&self) -> sockaddr_un { *self }
+                }
                 #[repr(C)]
                 #[derive(Copy, Clone)] pub struct ifaddrs {
                     pub ifa_next: *mut ifaddrs,
@@ -3116,7 +3134,7 @@ pub mod consts {
             pub const MAP_FIXED : c_int = 0x0010;
             pub const MAP_ANON : c_int = 0x0800;
 
-            pub const MAP_FAILED : *mut c_void = -1 as *mut c_void;
+            pub const MAP_FAILED : *mut c_void = !0 as *mut c_void;
 
             pub const MCL_CURRENT : c_int = 0x0001;
             pub const MCL_FUTURE : c_int = 0x0002;
@@ -3852,7 +3870,7 @@ pub mod consts {
             pub const MAP_FIXED : c_int = 0x0010;
             pub const MAP_ANON : c_int = 0x1000;
 
-            pub const MAP_FAILED : *mut c_void = -1 as *mut c_void;
+            pub const MAP_FAILED : *mut c_void = !0 as *mut c_void;
 
             pub const MCL_CURRENT : c_int = 0x0001;
             pub const MCL_FUTURE : c_int = 0x0002;
@@ -4306,7 +4324,7 @@ pub mod consts {
             pub const MAP_FIXED : c_int = 0x0010;
             pub const MAP_ANON : c_int = 0x1000;
 
-            pub const MAP_FAILED : *mut c_void = -1 as *mut c_void;
+            pub const MAP_FAILED : *mut c_void = !0 as *mut c_void;
 
             pub const MCL_CURRENT : c_int = 0x0001;
             pub const MCL_FUTURE : c_int = 0x0002;