basic: move missing_wait.h -> include/sys/wait.h

src/basic/include/sys/wait.h

@@ -1,13 +1,11 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-#include <sys/wait.h> /* IWYU pragma: export */
-
-#include "forward.h"
+#include_next <sys/wait.h>
 
 /* since glibc-2.36 */
 #ifndef P_PIDFD
 #  define P_PIDFD 3
 #else
-assert_cc(P_PIDFD == 3);
+_Static_assert(P_PIDFD == 3, "");
 #endif

src/basic/pidref.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <sys/wait.h>
 #include <unistd.h>
 
 #include "alloc-util.h"
@@ -8,7 +9,6 @@
 #include "format-util.h"
 #include "hash-funcs.h"
 #include "log.h"
-#include "missing_wait.h"
 #include "parse-util.h"
 #include "pidfd-util.h"
 #include "pidref.h"