cmake remove circular linking and reorganize

- px4_add_module now requires MAIN
 - px4_add_library doesn't automatically link

src/examples/fixedwing_control/CMakeLists.txt

@@ -38,6 +38,4 @@ px4_add_module(
 	SRCS
 		main.cpp
 	DEPENDS
-		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix : 

src/examples/fixedwing_control/main.cpp

@@ -52,8 +52,8 @@
 #include <px4_config.h>
 #include <px4_tasks.h>
 #include <systemlib/err.h>
-#include <systemlib/param/param.h>
-#include <systemlib/perf_counter.h>
+#include <parameters/param.h>
+#include <perf/perf_counter.h>
 #include <systemlib/pid/pid.h>
 #include <systemlib/systemlib.h>
 #include <uORB/topics/actuator_controls.h>

src/examples/fixedwing_control/params.h

@@ -38,7 +38,7 @@
  * Definition of parameters for fixedwing example
  */
 
-#include <systemlib/param/param.h>
+#include <parameters/param.h>
 
 struct params {
 	float hdng_p;