Merge #20434: contrib: Parse ELF directly for symbol and security checks

a0a771843fc39c3cc2574a51f009c3391e1808e9 contrib: Changes to checks for PowerPC64 (Luke Dashjr)
634f6ec4eb9997d7bd0f8209fad49a4171d42384 contrib: Parse ELF directly for symbol and security checks (Wladimir J. van der Laan)

Pull request description:

  Instead of the ever-messier text parsing of the output of the readelf tool (which is clearly meant for human consumption not to be machine parseable), parse the ELF binaries directly.

  Add a small dependency-less ELF parser specific to the checks.

  This is slightly more secure, too, because it removes potential ambiguity due to misparsing and changes in the output format of `elfread`. It also allows for stricter and more specific ELF format checks in the future.

  This removes the build-time dependency for `readelf`.

  It passes the test-security-check for me locally, ~~though I haven't checked on all platforms~~. I've checked that this works on the cross-compile output for all ELF platforms supported by Bitcoin Core at the moment, as well as PPC64 LE and BE.

Top commit has no ACKs.

Tree-SHA512: 7f9241fec83ee512642fecf5afd90546964561efd8c8c0f99826dcf6660604a4db2b7255e1afb1e9bb0211fd06f5dbad18a6175dfc03e39761a40025118e7bfc

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