Switch C++-style C headers with their C equivalents.

The C++ headers define the C functions within the std:: namespace, but
we mainly don't use the std:: namespace for C functions. Therefore we
should include the C headers.

BUG=1833
R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1917004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4486 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/test/testsupport/fileutils.cc b/webrtc/test/testsupport/fileutils.cc
index d4354d8..d19d50f 100644
--- a/webrtc/test/testsupport/fileutils.cc
+++ b/webrtc/test/testsupport/fileutils.cc
@@ -23,8 +23,8 @@
 #define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
 #endif
 
-#include <cstdio>
-#include <cstring>
+#include <stdio.h>
+#include <string.h>
 
 #include "webrtc/typedefs.h"  // For architecture defines