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ar.pm: Don't corrupt tables of symbols and long filenames

Marc Herbert requested to merge marc-guest/strip-nondeterminism:fix-symtab-longnames into master

  • Don't reset to "644" the pseudo-permissions of the symbols table '/'. Whatever the placeholder is ("0" with GNU ar 2.31), messing with it diverges with the output of GNU ar which is already deterministic.

  • Long filenames are stored in a special '//' section with a completely different format. Stop assuming it has regular metadata and stop corrupting it.

Split the fixes in different commits so the tests can be more easily be tested.

Edited by Marc Herbert

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