sitl_gazebo: update submodule
sitl_gazebo: update submodule

An include was missing.

krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,acfloria/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,PX4/Firmware,PX4/Firmware,krbeverx/Firmware,PX4/Firmware,dagar/Firmware,dagar/Firmware,krbeverx/Firmware,krbeverx/Firmware