add legacy futimes and lutimes functions

based on patch by sh4rm4. these functions are deprecated; futimens and
utimensat should be used instead in new programs.

include/sys/time.h

@@ -27,6 +27,8 @@ int utimes (const char *, const struct timeval [2]);
 #endif
 
 #ifdef _GNU_SOURCE
+int futimes(int, const struct timeval [2]);
+int lutimes(const char *, const struct timeval [2]);
 int settimeofday (const struct timeval *, void *);
 int adjtime (const struct timeval *, struct timeval *);
 struct timezone {

src/misc/futimes.c

+#include <sys/stat.h>
+#include <sys/time.h>
+#include <fcntl.h>
+
+int futimes(int fd, const struct timeval tv[2])
+{
+	struct timespec times[2];
+	times[0].tv_sec  = tv[0].tv_sec;
+	times[0].tv_nsec = tv[0].tv_usec * 1000;
+	times[1].tv_sec  = tv[1].tv_sec;
+	times[1].tv_nsec = tv[1].tv_usec * 1000;
+	return futimens(fd, times);
+}

src/misc/lutimes.c

+#include <sys/stat.h>
+#include <sys/time.h>
+#include <fcntl.h>
+
+int lutimes(const char *filename, const struct timeval tv[2])
+{
+	struct timespec times[2];
+	times[0].tv_sec  = tv[0].tv_sec;
+	times[0].tv_nsec = tv[0].tv_usec * 1000;
+	times[1].tv_sec  = tv[1].tv_sec;
+	times[1].tv_nsec = tv[1].tv_usec * 1000;
+	return utimensat(AT_FDCWD, filename, times, AT_SYMLINK_NOFOLLOW);
+}