Makefile: don't do any git submodule magic
Makefile: don't do any git submodule magic

Let's do all the submodule stuff in check_submodules.sh

PX4/Firmware,darknight-007/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,darknight-007/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,PX4/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,krbeverx/Firmware,dagar/Firmware,dagar/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware,darknight-007/Firmware,Aerotenna/Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,krbeverx/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,darknight-007/Firmware,darknight-007/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,jlecoeur/Firmware,dagar/Firmware,krbeverx/Firmware,Aerotenna/Firmware,PX4/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,dagar/Firmware,jlecoeur/Firmware,acfloria/Firmware,acfloria/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,PX4/Firmware,acfloria/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware