OSSL_STORE: constify the criterion parameter a bit more

For some reason, OSSL_STORE_SEARCH_get0_name() and OSSL_STORE_find()
accepted a non-const OSSL_STORE_SEARCH criterion, which isn't at all
necessary.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8442)
3 files changed