cleanup cruft left from when kernel and user time_t disagreed

src/linux/wait3.c

+#define _GNU_SOURCE
 #include <sys/wait.h>
 #include <sys/resource.h>
 #include "syscall.h"
 
-pid_t wait4(pid_t, int *, int, struct rusage *);
-
 pid_t wait3(int *status, int options, struct rusage *usage)
 {
 	return wait4(-1, status, options, usage);

src/linux/wait4.c

+#define _GNU_SOURCE
 #include <sys/wait.h>
 #include <sys/resource.h>
 #include <string.h>
@@ -5,14 +6,5 @@
 
 pid_t wait4(pid_t pid, int *status, int options, struct rusage *usage)
 {
-	pid_t ret = syscall4(__NR_wait4, pid, (long)status, options, (long)usage);
-	/* Fixup kernel time_t... */
-	if (usage) {
-		long kusage[4];
-		memcpy(kusage, usage, sizeof kusage);
-		memmove((struct timeval *)usage + 2, (long *)usage + 4, sizeof *usage - 2*sizeof(struct timeval));
-		usage->ru_utime = (struct timeval){ kusage[0], kusage[1] };
-		usage->ru_stime = (struct timeval){ kusage[2], kusage[3] };
-	}
-	return ret;
+	return syscall4(__NR_wait4, pid, (long)status, options, (long)usage);
 }