libsodium: remove DEFAULT

Signed-off-by: Steven Barth <steven@midlink.org>
micropython: simplify makefile + update

Platform detection now done upstream.

Signed-off-by: Roger D <rogerdammit@gmail.com>
Merge pull request #277 from roger-/micropython

micropython: simplify makefile + update
libmodbus: include licensing information

Signed-off-by: Michael Heimpold <mhei@heimpold.de>