getThreadID defined elsewhere upstream.

Core/Build/Linux/PolycodeView.cpp

@@ -3,10 +3,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-long getThreadID() {
-        return (long)pthread_self();
-}
-
 PolycodeView::PolycodeView(const char *title) : PolycodeViewBase() {
 	windowTitle = title;
 	windowData = &windowTitle;