Cleanup support for specifying PKCS#11 engine as part of the label

Merged Ondřej Surý requested to merge ondrej/remove-OpenSSL-engine-specification-in-label into master

The code for specifying OpenSSL PKCS#11 engine as part of the label (e.g. -l "pkcs11:token=..." instead of -E pkcs11 -l "token=...") was non-functional. This commit just cleans the related code.

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