Revert "Implement the way to run posix simulator directly from IDE without the need to reconfigure command lines, but use runner created via CMake"

This reverts commit fff4934743.

src/platforms/posix/main.cpp

@@ -286,13 +286,7 @@ static void set_cpu_scaling()
 #endif
 }
 
-#ifdef __PX4_SITL_MAIN_OVERRIDE
-int SITL_MAIN(int argc, char **argv);
-
-int SITL_MAIN(int argc, char **argv)
-#else
 int main(int argc, char **argv)
-#endif
 {
 	bool daemon_mode = false;
 	bool chroot_on = false;