Add #include "Print.h" in Server.h

Author: spiritinlife

Diff for: hardware/arduino/sam/cores/arduino/Server.h

@@ -20,6 +20,8 @@
 #ifndef server_h
 #define server_h
 
+#include "Print.h"
+
 class Server : public Print {
 public:
   virtual void begin() =0;