[99s-extend] do not treat warnings as errors on make?

[Anton Koval']

Hello,

as I understand, by default `make all` performs compile with option
warnings_as_errors. How can I disable this option?
There are options described at
https://github.com/extend/erlang.mk#optionsand I believe that
ERLC_OPTS
should be filled with `-warnings_as_errors`. But it is unclear for me where
have I to add(put) that option?

Thanks.
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