lessc (node-less) and lesscpy do not produce the same output.
There are some minor whitespace +-1 in color values which
are not important but the output file is not stable
However lesscpy removes comments and so the license of the output file
As it produces an invalid file it support is dropped.
https://lesscpy.readthedocs.io/en/latest/#differences-from-less-js
fixes tons of false warnings on cpu_conf.h headers in cpu
/tmp/RIOT/cpu/atmega1281/include/cpu_conf.h:12: warning: the name `/tmp/RIOT/cpu/atmega1281/include/cpu_conf.h' supplied as the second argument in the \file statement matches the following input files:
/tmp/RIOT/cpu/atmega1281/include/cpu_conf.h
Please use a more specific name by including a (larger) part of the path!
