Replace #include <stdio.h> with #include <cstdio> to solve gcc4mbed compiler problem

Fork of MbedJSONValue by Samuel Mokrani

Revision:
5:7c0afc41a115
Parent:
3:f2ffae08b963
--- a/MbedJSONValue.cpp	Thu Sep 22 10:57:37 2011 +0000
+++ b/MbedJSONValue.cpp	Sat Nov 18 19:11:20 2017 +0000
@@ -1,7 +1,7 @@
 #include "MbedJSONValue.h"
 
 # include <stdlib.h>
-# include <stdio.h>
+# include <cstdio>
 
 // Clean up
 void MbedJSONValue::clean() {