ksud: make it compilable for non-android

userspace/ksud/src/restorecon.rs

@@ -1,4 +1,5 @@
 use anyhow::{Context, Ok, Result};
+#[cfg(target_os = "android")]
 use extattr::{setxattr, Flags as XattrFlags};
 use jwalk::{Parallelism::Serial, WalkDir};
 
@@ -6,6 +7,7 @@ const SYSTEM_CON: &str = "u:object_r:system_file:s0";
 const _ADB_CON: &str = "u:object_r:adb_data_file:s0";
 
 pub fn setcon(path: &str, con: &str) -> Result<()> {
+    #[cfg(target_os = "android")]
     setxattr(path, "security.selinux", con, XattrFlags::empty())
         .with_context(|| format!("Failed to change SELinux context for {path}"))?;
     Ok(())
@@ -18,6 +20,7 @@ pub fn setsyscon(path: &str) -> Result<()> {
 pub fn restore_syscon(dir: &str) -> Result<()> {
     for dir_entry in WalkDir::new(dir).parallelism(Serial) {
         if let Some(path) = dir_entry.ok().map(|dir_entry| dir_entry.path()) {
+            #[cfg(target_os = "android")]
             setxattr(&path, "security.selinux", SYSTEM_CON, XattrFlags::empty()).with_context(
                 || {
                     format!(