add android to the target OS for setfsuid and setfsgid, and remove in…

…line attribute

src/unistd.rs

@@ -1398,25 +1398,23 @@ pub fn setgid(gid: Gid) -> Result<()> {
     Errno::result(res).map(drop)
 }
 
-/// Set the user identity used for filesystem checks.
+/// Set the user identity used for filesystem checks per-thread.
 /// On both success and failure, this call returns the previous filesystem user
 /// ID of the caller.
 ///
 /// See also [setfsuid(2)](http://man7.org/linux/man-pages/man2/setfsuid.2.html)
-#[cfg(target_os = "linux")]
-#[inline]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn setfsuid(uid: Uid) -> Uid {
     let prev_fsuid = unsafe { libc::setfsuid(uid.into()) };
     Uid::from_raw(prev_fsuid as uid_t)
 }
 
-/// Set the group identity used for filesystem checks.
+/// Set the group identity used for filesystem checks per-thread.
 /// On both success and failure, this call returns the previous filesystem group
 /// ID of the caller.
 ///
 /// See also [setfsgid(2)](http://man7.org/linux/man-pages/man2/setfsgid.2.html)
-#[cfg(target_os = "linux")]
-#[inline]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn setfsgid(gid: Gid) -> Gid {
     let prev_fsgid = unsafe { libc::setfsgid(gid.into()) };
     Gid::from_raw(prev_fsgid as gid_t)