Comment 60 for bug 1740892

another quick update base on a discussion between nacc/slangasek and myself :

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<nacc> slangasek: fair, above patch results in https://paste.ubuntu.com/p/hb68G8rpMw/
<slangasek> nacc: those are pretty clearly internal symbols which are not part of the ABI and you should just mark them (optional) instead of doing an architecture-based exclusion list
<slangasek> and when I say mark them (optional), I mean mark them '(optional)'
<slangasek> nacc: dropping the symbols, or marking them optional, both valid. (optional) would make the same source package more cleanly backportable to older toolchains
<slangasek> but a symbol that starts with a __ and isn't listed in the public headers for the library, and especially that doesn't originate in the source of this library, can be assumed safe to drop from .symbols