external/bsd/file libmagic: Add expected symbols list.

NOTE: This has some extraneous crud: lib/58842: libmagic leaks
private and zstd symbols. (The zstd part has been addressed but not
the extrane

external/bsd/file libmagic: Add expected symbols list.

NOTE: This has some extraneous crud: lib/58842: libmagic leaks
private and zstd symbols. (The zstd part has been addressed but not
the extraneous crud.)

PR lib/58838: shared libraries in base should all have expsym lists

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