Added stubs for NetClose on other platforms

These will need someone with much better experience to implement correctly to abort the net window

src/common/platform/posix/cocoa/st_console.h

@@ -66,6 +66,7 @@ public:
 	void NetInit(const char* message, int playerCount);
 	void NetProgress(int count);
 	void NetDone();
+	void NetClose();
 
 private:
 	NSWindow*            m_window;

src/common/platform/posix/cocoa/st_console.mm

@@ -531,3 +531,8 @@ void FConsoleWindow::NetDone()
 		m_netAbortButton = nil;
 	}
 }
+
+void FConsoleWindow::NetClose()
+{
+	// TODO: Implement this
+}

src/common/platform/posix/cocoa/st_start.mm

@@ -110,6 +110,11 @@ void FBasicStartupScreen::NetDone()
 	FConsoleWindow::GetInstance().NetDone();
 }
 
+void FBasicStartupScreen::NetClose()
+{
+	FConsoleWindow::GetInstance().NetClose();
+}
+
 bool FBasicStartupScreen::NetLoop(bool (*timerCallback)(void*), void* const userData)
 {
 	while (true)

src/common/platform/posix/sdl/st_start.cpp

@@ -57,6 +57,7 @@ class FTTYStartupScreen : public FStartupScreen
 		void NetInit(const char *message, int num_players);
 		void NetProgress(int count);
 		void NetDone();
+		void NetClose();
 		bool NetLoop(bool (*timer_callback)(void *), void *userdata);
 	protected:
 		bool DidNetInit;
@@ -237,6 +238,11 @@ void FTTYStartupScreen::NetProgress(int count)
 	}
 }
 
+void FTTYStartupScreen::NetClose()
+{
+	// TODO: Implement this
+}
+
 //===========================================================================
 //
 // FTTYStartupScreen :: NetLoop