cross compile static binaries for x86_64 and aarch64

Charles Hallrequested to merge
CobaltCause/conduit:cross into next

Continuing on from !564 (comment 1740444901).

For reviewing this, it'll probably be easiest to look at each commit on its own in series. That should be relatively easy to follow, up until the actual "add static cross to $TARGET" commits, where it necessarily gets pretty involved.

  • I agree to release my code and all other changes of this MR under the Apache-2.0 license
Edited by Charles Hall

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