FluffOS - internals / dump_file_descriptors

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This is a companion discussion topic for the original entry at https://www.fluffos.info/efun/internals/dump_file_descriptors.html

Get this message when trying to use this efun. Does it still need to be documented?

> eval return dump_file_descriptors()
Result = "ERROR: dump_file_descriptors is no longer supported."

we should totally delete it now