Some warnings fixed

Utilities/Thread.h

@@ -2,13 +2,6 @@
 
 static std::thread::id main_thread;
 
-struct rThread
-{
-	static bool IsMain() { std::this_thread::get_id() == main_thread; }
-};
-
-class ThreadExec;
-
 class NamedThreadBase
 {
 	std::string m_name;

rpcs3/Emu/SysCalls/SC_FUNC.h

@@ -5,6 +5,7 @@ class func_caller
 {
 public:
 	virtual void operator()() = 0;
+	virtual ~func_caller(){};
 };
 
 namespace detail