oops, we've got to stub FCEUD_FlushTrace on these other platforms

src/drivers/Qt/TraceLogger.cpp

@@ -1291,6 +1291,13 @@ int FCEUD_TraceLoggerRunning(void)
 {
 	return logging;
 }
+
+void FCEUD_FlushTrace()
+{
+	//not needed, since it's doing something in a thread, i guess.
+	//seems weird that there's no way to rendezvous with it
+}
+
 //----------------------------------------------------
 //todo: really speed this up
 void FCEUD_TraceInstruction(uint8 *opcode, int size)

src/drivers/sdl/debugger.cpp

@@ -1709,6 +1709,11 @@ void FCEUD_DebugBreakpoint(int bp_num)
 	}
 }
 
+void FCEUD_FlushTrace()
+{
+   // Place holder to allow for compiling. GTK GUI doesn't support this. Qt Does.
+}
+
 void FCEUD_TraceInstruction(uint8 *opcode, int size)
 {
    // Place holder to allow for compiling. GTK GUI doesn't support this. Qt Does.

src/drivers/sdl/sdl.cpp

@@ -526,6 +526,13 @@ void FCEUD_DebugBreakpoint() {
 	return;
 }
 
+/**
+ * Unimplemented.
+ */
+void FCEUD_FlushTrace()
+{
+}
+
 /**
  * Unimplemented.
  */