Makefile: redirect the "common" directory (old: stdlib)
Makefile: redirect the "common" directory (old: stdlib)

UrsusPilot/firmware,fboris/firmware,ming6842/firmware-new,shengwen1997/moonbear-firmware,fboris/firmware,ming6842/firmware-new,zxc2694/moonbear-firmware,zxc2694/moonbear-firmware,shengwen1997/moonbear-firmware,zxc2694/moonbear-firmware,UrsusPilot/firmware,shengwen1997/moonbear-firmware,fboris/firmware,ming6842/firmware,UrsusPilot/firmware,ming6842/firmware,ming6842/firmware,ming6842/firmware-new