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c03f0c3062
During 'make man', makedocbook falsely reports "texinfo command '@modifier' remains in output" while processing the setlocal(3) manpage, which contains that literal string. Move the check for unrecognized texinfo commands to before processing '@@' (an escaped '@') in the texinfo source, and teach it to ignore them. Improve that check slightly, so it catches non-alphabetic texinfo commands, of which there are few. Now we don't have false positives, we can make unrecognized texinfo commands fatal to manpage generation, rather than leaving them verbatim in the generated manpage.