Bug 1424114 - Add missing string.h include in timecard.c. r=jesup

--HG--
extra : rebase_source : e81ef4ec2d920dc0ef3e0f70fc5e7bd68c23e755

media/webrtc/signaling/src/common/time_profiling/timecard.c

@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include <stdio.h>
+#include <string.h>
 #include "timecard.h"
 #include "mozilla/mozalloc.h"