provider: add an unquery function to allow providers to clean up.

Without this, a provider has no way to know that an application
has finished with the array it returned earlier. A non

provider: add an unquery function to allow providers to clean up.

Without this, a provider has no way to know that an application
has finished with the array it returned earlier. A non-caching provider
requires this information.

Fixes #12974

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12974)

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