crypto/engine/eng_devcrypto.c: open /dev/crypto only once
We opened /dev/crypto once for each session, which is quite unnecessary. With this change, we open /dev/crypto once at engine init, and close it on unload. Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> (Merged from https://github.com/openssl/openssl/pull/7506)
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