[skip ci] Updated licenses and gitignores

Author: GiteaBot

options/license/Net-SNMP

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+If you modify this Program, or any covered work, by linking or
+combining it with runtime libraries of Erlang/OTP as released by
+Ericsson on https://www.erlang.org (or a modified version of these
+libraries), containing parts covered by the terms of the Erlang Public
+License (https://www.erlang.org/EPLICENSE), the licensors of this
+Program grant you additional permission to convey the resulting work
+without the need to license the runtime libraries of Erlang/OTP under
+the GNU Affero General Public License. Corresponding Source for a
+non-source form of such a combination shall include the source code
+for the parts of the runtime libraries of Erlang/OTP used as well as
+that of the covered work.