use px4_defines header to distinguish platform

src/platforms/px4_defines.h

@@ -36,7 +36,6 @@
  *
  * Generally used magic defines
  */
-
 #pragma once
 
 #if defined(__linux) || (defined(__APPLE__) && defined(__MACH__))
@@ -45,6 +44,7 @@
  */
 #define __EXPORT
 //#define PX4_MAIN_FUNCTION(_prefix)
+#define ORB_DECLARE(x)
 #else
 #include <nuttx/config.h>
 //#define PX4_MAIN_FUNCTION(_prefix) __EXPORT int _prefix##main(int argc, char **argv)() { return main(argc, argv); }
@@ -53,4 +53,6 @@
 #include "drv_orb_dev.h"
 #define ACCEL_DEVICE_PATH	"/dev/accel"
 
+#include <modules/uORB/uORB.h>
+
 #endif