enable -fno-math-errno as we never check errno (#9281)
enable -fno-math-errno as we never check errno (#9281)

- disables setting of the errno variable as required by C89/C99 on calling math library routines
PX4/Firmware,dagar/Firmware,dagar/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware,Aerotenna/Firmware,acfloria/Firmware,PX4/Firmware,PX4/Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,dagar/Firmware,PX4/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,acfloria/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,dagar/Firmware,krbeverx/Firmware,Aerotenna/Firmware,acfloria/Firmware,dagar/Firmware,krbeverx/Firmware,acfloria/Firmware