dumpon: update OpenSSL initialization call

[emaste]

Test Plan

ERR_load_crypto_strings() was deprecated in OpenSSL 1.1.0, and explicit
initialization is generally not reqiured.  In the case of dumpon however
we need to initialize prior to entering capability mode, so replace with
an OPENSSL_init_crypto call.

Sponsored by:   The FreeBSD Foundation

[emaste]

This is a minimal change to avoid calling the deprecated interface; @ngie's D40296 is the full update for dumpon.

[emaste]

• Incorporate D40355 (I mixed up the dumpon and decryptcore changes and thought I had already submitted D40353)

[ngie]

Some of the comments I found elsewhere suggested this is unnecessary with OpenSSL 1.1+. Is this truly needed?

[emaste]

Is this truly needed?

For applications that enter capability mode I'm opting to err on the side of caution.