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e5a0bece6edoc: add OpenSSL removal to release-notes.md (fanquake)397dbae070ci: remove OpenSSL installation (fanquake)a4eb839619doc: remove OpenSSL from build instructions and licensing info (fanquake)648b2e3c32depends: remove OpenSSL package (fanquake)8983ee3e6dbuild: remove OpenSSL detection and libs (fanquake)b49b6b0f70random: Remove remaining OpenSSL calls and locking infrastructure (fanquake)4fcfcc294erandom: stop retrieving random bytes from OpenSSL (fanquake)5624ab0b4frandom: 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: ACKe5a0bece6elaanwj: ACKe5a0bece6eTree-SHA512: 02fce08ec91d20e0da51e9314eec53dcf8699cded02f0a005417d627520c20b826332cb42bdae132af283d4903aa3088a9f613f3aea915d655a51532a4d4796c