Logging fixes and enhancements

Made the logging macros generic so they can be used for multiple targets.

Fixed toolchain_native.mk so err.h is included from src/systemlib for posix.

Reduced debug output for uORB.

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

src/modules/uORB/uORBDevices_posix.cpp

@@ -443,7 +443,7 @@ uORB::DeviceMaster::DeviceMaster(Flavor f) :
   _flavor(f)
 {
   // enable debug() calls
-  _debug_enabled = true;
+  //_debug_enabled = true;
 
 }