Fixing solaris build bustage when building with tests enabled. r=sayrer, sr=biesi, a=jst

xpcom/tests/TestStringAPI.cpp

@@ -34,7 +34,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-#include <cstdio>
+#include <stdio.h>
 #include "nsStringAPI.h"
 
 #define CHECK(x) \