mjb/altos/src/mpusb-v3.0/flash-loader/Makefile, branch 1.4.1

mjb/altos/src/mpusb-v3.0/flash-loader/Makefile, branch 1.4.1 AltOS - the operating system for Altus Metrum products https://git.ethernal.org/mjb/altos/atom?h=1.4.1