openssl: 2.2.4 release

[Vasilij Schneidermann]

Hello,

I've released openssl 2.2.4 to resolve an issue in the `file-cipher` and
`file-digest` procedures returning incorrect results for file sizes
that are not an exact multiple of 4096. I have to thank elflng for
finding the issue and megane with root cause analysis. As a result of
this, the `cipher-context-update!` and `digest-context-update!`
procedures have been amended to accept an optional `effective-length`
argument to read in less than the full blob.

If anyone else is using or considers using the `file-cipher` and
`file-digest` procedures, I strongly urge them to update to avoid
inconsistencies.

Vasilij

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