basic: move missing_sched.h -> include/sched.h

src/shared/nsflags.h

@@ -1,8 +1,9 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
+#include <sched.h>
+
 #include "forward.h"
-#include "missing_sched.h"
 
 /* The combination of all namespace flags defined by the kernel. The right type for this isn't clear. setns() and
  * unshare() expect these flags to be passed as (signed) "int", while clone() wants them as "unsigned long". The latter

src/shared/nsresource.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <sched.h>
 #include <sys/prctl.h>
 
 #include "sd-varlink.h"
@@ -9,7 +10,6 @@
 #include "format-util.h"
 #include "json-util.h"
 #include "log.h"
-#include "missing_sched.h"
 #include "namespace-util.h"
 #include "nsresource.h"
 #include "process-util.h"