Wladimir J. van der Laan 2065ef66ee
Merge #17265: Remove OpenSSL
e5a0bece6e84402fcb1fe4f25fd24da1d21ec077 doc: add OpenSSL removal to release-notes.md (fanquake)
397dbae070dca9a635ff3d1d61add09db004661e ci: remove OpenSSL installation (fanquake)
a4eb83961965347792e9ac75928aae359d5f7405 doc: remove OpenSSL from build instructions and licensing info (fanquake)
648b2e3c3288ee0b83d4089d27fa7f84a73d118e depends: remove OpenSSL package (fanquake)
8983ee3e6dd8ab658bd2caf97c326cc53ea50818 build: remove OpenSSL detection and libs (fanquake)
b49b6b0f7090cc15860d815fb0ef306ddfc718ba random: Remove remaining OpenSSL calls and locking infrastructure (fanquake)
4fcfcc294e7cb17956e283d09050cb997093a35d random: stop retrieving random bytes from OpenSSL (fanquake)
5624ab0b4f844dc7c17aeb1b009f002c33c38fb3 random: stop feeding RNG output back into OpenSSL (fanquake)

Pull request description:

  Now that #17165 has been merged, removing our remaining OpenSSL usage is possible.

  That remaining usage was a call to [`RAND_bytes`](https://www.openssl.org/docs/manmaster/man3/RAND_bytes.html) during the ::SLOW path of [ProcRand](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L616). As well as feeding output from our RNG back into OpenSSL via [`RAND_add`](https://www.openssl.org/docs/manmaster/man3/RAND_add.html) during the ::SLOW and ::SLEEP paths.

  Optimistically tagged for `0.20.0`. Needs discussion, potentially in an upcoming weekly meeting?

  Closes #12530.

ACKs for top commit:
  MarcoFalke:
    ACK e5a0bece6e84402fcb1fe4f25fd24da1d21ec077
  laanwj:
    ACK e5a0bece6e84402fcb1fe4f25fd24da1d21ec077

Tree-SHA512: 02fce08ec91d20e0da51e9314eec53dcf8699cded02f0a005417d627520c20b826332cb42bdae132af283d4903aa3088a9f613f3aea915d655a51532a4d4796c
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