delete __STDC_{FORMAT,LIMIT}_MACROS

With newer glibc versions (2.18+), these macros no longer exist (and the
functionality they protected are always enabled).  Delete them.

BUG=chromium:401360
TEST=precq passes

Change-Id: I21b0607a874b9f9e39dff050054a2928a6c55023
Reviewed-on: https://chromium-review.googlesource.com/262903
Trybot-Ready: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/metrics/metrics_daemon.cc b/metrics/metrics_daemon.cc
index 4ea899f..9568592 100644
--- a/metrics/metrics_daemon.cc
+++ b/metrics/metrics_daemon.cc
@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// For PRIu64 in inttypes.h, used by scanf.  TODO(semenzato): replace
-// with libchromeos methods.
-#define __STDC_FORMAT_MACROS
-
 #include "metrics/metrics_daemon.h"
 
 #include <fcntl.h>
diff --git a/metrics/metrics_daemon_test.cc b/metrics/metrics_daemon_test.cc
index a282bff..3055013 100644
--- a/metrics/metrics_daemon_test.cc
+++ b/metrics/metrics_daemon_test.cc
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#define __STDC_FORMAT_MACROS
-
 #include <inttypes.h>
 #include <utime.h>