Allow passing $tag for non-authenticated encryption

openssl_encrypt() currently throws a warning if the $tag out
parameter is passed for a non-authenticated cipher. This violates
the principle that a function should behave the same if a parameter
is not passed, and if the default value is passed for the parameter.

I believe this warning should simply be dropped and the $tag be
populated with null, as is already the case. Otherwise, it is not
possible to use openssl_encrypt() in generic wrapper APIs, that are
compatible with both authenticated and non-authenticated encryption.

Closes GH-6333.

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