message: core: don't use global_include.h in log.h
diff: #pragma once
  #include <sstream>
  -#include "global_include.h"
  #if ANDROID
  #include <android/log.h>
  @@ -82,8 +81,9 @@ public:
  __android_log_print(ANDROID_LOG_ERROR, "DroneCore", "%s", _s.str().c_str());
  break;
  }
  - UNUSED(_caller_filename);
  - UNUSED(_caller_filenumber);
  + // Unused:
  + (void)_caller_filename;
  + (void)_caller_filenumber;
  #else
  switch (_log_level) {
  