heimdal: Add expected symbols lists.

Excluded:

- libasn1 -- exported symbol list is currently machine-dependent
(vax, m68k, amd64 have _end/_init/_fini; earmv7 only has _end;
aarch64 adds _bss_

heimdal: Add expected symbols lists.

Excluded:

- libasn1 -- exported symbol list is currently machine-dependent
(vax, m68k, amd64 have _end/_init/_fini; earmv7 only has _end;
aarch64 adds _bss_end__, __end__, __bss_end__, __bss_start__; ...)
because it just does `global: *'
- libkafs, libsl -- no symbol version map, so exported list is
currently machine-dependent
- libkadm5clnt -- has a symbol version map, but we're not using it
(PR lib/58795: libkadm5clnt.so is built without symbol version map)
so exported symbol list is currently machine-dependent

Preparing for adopting VERSION_MAP to fix:

PR lib/58376: Missing DPADD for library version scripts

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