Workaround to land the rustup while we wait for rust-errno

components/servo/lib.rs

@@ -252,3 +252,12 @@ pub fn run_content_process(token: String) {
                                      script::script_thread::ScriptThread>(true);
 }
 
+// This is a workaround for https://github.com/rust-lang/rust/pull/30175 until
+// https://github.com/lfairy/rust-errno/pull/5 lands, and should be removed once
+// we update Servo with the rust-errno crate.
+#[cfg(target_os = "android")]
+#[no_mangle]
+pub unsafe extern fn __errno_location() -> *mut i32 {
+    extern { fn __errno() -> *mut i32; }
+    __errno()
+}