*: do not assign to stdout/stderr, it's not portable.

Based on patch by Aaron Carroll <xaaronc@gmail.com>

function                                             old     new   delta
time_main                                           1062    1052     -10
cpio_main                                            563     549     -14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/miscutils/time.c b/miscutils/time.c
index 42c812a..3421736 100644
--- a/miscutils/time.c
+++ b/miscutils/time.c
@@ -414,9 +414,7 @@
 	run_command(argv, &res);
 
 	/* Cheat. printf's are shorter :) */
-	/* (but see bb_putchar() body for additional wrinkle!) */
-	xdup2(2, 1); /* just in case libc does something silly :( */
-	stdout = stderr;
+	xdup2(STDERR_FILENO, STDOUT_FILENO);
 	summarize(output_format, argv, &res);
 
 	if (WIFSTOPPED(res.waitstatus))