https://github.com/curl/curl/commit/e2e7f54b7bea521fa8373095d0f43261a720cda0
https://bugs.gentoo.org/855710

From e2e7f54b7bea521fa8373095d0f43261a720cda0 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 27 Jun 2022 08:46:21 +0200
Subject: [PATCH] easy_lock.h: include sched.h if available to fix build

Patched-by: Harry Sintonen

Closes #9054
--- a/lib/easy_lock.h
+++ b/lib/easy_lock.h
@@ -36,6 +36,9 @@
 
 #elif defined (HAVE_ATOMIC)
 #include <stdatomic.h>
+#if defined(HAVE_SCHED_YIELD)
+#include <sched.h>
+#endif
 
 #define curl_simple_lock atomic_bool
 #define CURL_SIMPLE_LOCK_INIT false