document need for an ARM Cortex toolchain in /opt/cortex, point to build docs

[fw/altos] / debian / README.build

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+The firmware for the various target microcontrollers will only be built if
+suitable compilers are present.  All of these are specified in the build
+dependencies *except* for the ARM Cortex targets which currently require a
+bare-metal toolchain which is not yet packaged for Debian.
+
+See http://altusmetrum.org/AltOS/building for details on how to build and
+install a suitable toolchaing for ARM Cortex M0 and M3 hardware targets.