QuRT and POSIX changes

Partial commit of the changes for QuRT and related changes for POSIX

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/simulator/simulator.h

@@ -148,7 +148,9 @@ private:
 	Simulator() : _accel(1), _mpu(1), _baro(1) {}
 	~Simulator() { _instance=NULL; }
 
+#ifndef __PX4_QURT
 	void updateSamples();
+#endif
 
 	static Simulator *_instance;