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5e7bedc5ad
Prefer to call "rl_filename_completion_function" and "rl_completion_matches", rather than using the names without the rl_ prefix. This matches Readline's documentation, and makes our code a little clearer about which names are external. On platforms that only have the un-prefixed names (just some very ancient versions of libedit, AFAICT), reverse the direction of the compatibility macro definitions to match. Also, remove our extern declaration of "filename_completion_function"; whatever libedit versions may have failed to declare that are surely dead and buried. Discussion: https://postgr.es/m/23608.1576248145@sss.pgh.pa.us