Use platform TLS keys for entity small IDs

Minecraft.World/Blocks/Tile.h

@@ -3,6 +3,9 @@
 #include "../Util/Vec3.h"
 #include "../Util/Definitions.h"
 #include "../Util/SoundTypes.h"
+#if !defined(_WIN32)
+#include <pthread.h>
+#endif
 
 
 class GrassTile;
@@ -55,7 +58,11 @@ protected:
 		int tileId;
 		ThreadStorage();
 	};
+#if defined(_WIN32)
 	static DWORD tlsIdxShape;
+#else
+	static pthread_key_t tlsIdxShape;
+#endif
 public:	
 	// Each new thread that needs to use Vec3 pools will need to call one of the following 2 functions, to either create its own
 	// local storage, or share the default storage already allocated by the main thread