NetworkSingleton: Fixed a throw warning in VS2017. (#3792)

Also fixed the misleading name.

src/OSSupport/NetworkSingleton.cpp

@@ -23,7 +23,7 @@ cNetworkSingleton::cNetworkSingleton() :
 
 
 
-cNetworkSingleton::~cNetworkSingleton()
+cNetworkSingleton::~cNetworkSingleton() CAN_THROW
 {
 	// Check that Terminate has been called already:
 	ASSERT(m_HasTerminated);

src/OSSupport/NetworkSingleton.h

@@ -41,7 +41,7 @@ class cNetworkSingleton
 {
 public:
 	cNetworkSingleton();
-	~cNetworkSingleton();
+	~cNetworkSingleton() CAN_THROW;
 
 	/** Returns the singleton instance of this class */
 	static cNetworkSingleton & Get(void);