How can I disable SNMPv3
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Question
How do I disable SNMPv3 when there is no --disable-snmpv3 option to configure
Answer
You can't.
What you can do is to remove the snmpv3mib and the vacm-mib, and since that means there will be no need for any hashing or security code you could also remove those parts so the end result is that you add
--with-out-mib-modules=snmpv3mib,mibII/vacm --disable-privacy \ --disable-md5 --without-openssl
to your configure line