implement futimens and utimensat

src/stat/futimens.c

@@ -0,0 +1,6 @@
+#include <sys/stat.h>
+
+int futimens(int fd, const struct timespec times[2])
+{
+	return utimensat(fd, 0, times, 0);
+}

src/stat/utimensat.c

@@ -0,0 +1,7 @@
+#include <sys/stat.h>
+#include "syscall.h"
+
+int utimensat(int fd, const char *path, const struct timespec times[2], int flags)
+{
+	return syscall4(__NR_utimensat, fd, (long)path, (long)times, flags);
+}