std: use correct clock in park_timeout on Horizon

Author: joboet

library/std/src/sys/unix/thread_parker/pthread.rs

@@ -46,7 +46,8 @@ unsafe fn wait_timeout(
         target_os = "macos",
         target_os = "ios",
         target_os = "watchos",
-        target_os = "espidf"
+        target_os = "espidf",
+        target_os = "horizon",
     ))]
     let (now, dur) = {
         use crate::cmp::min;
@@ -72,7 +73,8 @@ unsafe fn wait_timeout(
         target_os = "macos",
         target_os = "ios",
         target_os = "watchos",
-        target_os = "espidf"
+        target_os = "espidf",
+        target_os = "horizon",
     )))]
     let (now, dur) = {
         use crate::sys::time::Timespec;