Move setdomainname and getdomainname into linux_like.

(backport <#4212>)
(cherry picked from commit b0d8e18)

Author: sunfishcode

src/unix/linux_like/android/mod.rs

@@ -4126,9 +4126,6 @@ extern "C" {
         newpath: *const c_char,
         flags: c_uint,
     ) -> c_int;
-
-    pub fn getdomainname(name: *mut c_char, len: size_t) -> c_int;
-    pub fn setdomainname(name: *const c_char, len: size_t) -> c_int;
 }
 
 cfg_if! {

src/unix/linux_like/emscripten/mod.rs

@@ -1574,8 +1574,6 @@ extern "C" {
     pub fn mkstemps(template: *mut c_char, suffixlen: c_int) -> c_int;
     pub fn nl_langinfo(item: crate::nl_item) -> *mut c_char;
 
-    pub fn getdomainname(name: *mut c_char, len: size_t) -> c_int;
-    pub fn setdomainname(name: *const c_char, len: size_t) -> c_int;
     pub fn sendmmsg(
         sockfd: c_int,
         msgvec: *mut crate::mmsghdr,

src/unix/linux_like/linux/mod.rs

@@ -6342,8 +6342,6 @@ extern "C" {
 
     pub fn nl_langinfo(item: crate::nl_item) -> *mut c_char;
 
-    pub fn getdomainname(name: *mut c_char, len: size_t) -> c_int;
-    pub fn setdomainname(name: *const c_char, len: size_t) -> c_int;
     pub fn vhangup() -> c_int;
     pub fn sync();
     pub fn syncfs(fd: c_int) -> c_int;

src/unix/linux_like/mod.rs

@@ -1875,6 +1875,9 @@ extern "C" {
 
     pub fn mkostemp(template: *mut c_char, flags: c_int) -> c_int;
     pub fn mkostemps(template: *mut c_char, suffixlen: c_int, flags: c_int) -> c_int;
+
+    pub fn getdomainname(name: *mut c_char, len: size_t) -> c_int;
+    pub fn setdomainname(name: *const c_char, len: size_t) -> c_int;
 }
 
 // LFS64 extensions