Logging: Fix C++11 warning (errors with GCC)
Logging: Fix C++11 warning (errors with GCC)

diydrones/apm_planner,kellyschrock/apm_planner,mirkix/apm_planner,dcarpy/apm_planner,kellyschrock/apm_planner,kellyschrock/apm_planner,xros/apm_planner,dcarpy/apm_planner,diydrones/apm_planner,kellyschrock/apm_planner,dcarpy/apm_planner,diydrones/apm_planner,mirkix/apm_planner,xros/apm_planner,dcarpy/apm_planner,xros/apm_planner,diydrones/apm_planner,kellyschrock/apm_planner,mirkix/apm_planner,diydrones/apm_planner,mirkix/apm_planner,mirkix/apm_planner,dcarpy/apm_planner,xros/apm_planner,kellyschrock/apm_planner,dcarpy/apm_planner,diydrones/apm_planner,xros/apm_planner,mirkix/apm_planner,xros/apm_planner