parse-options: allow callbacks to take no arguments at all.
Signed-off-by: NPierre Habouzit <madcoder@debian.org> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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Signed-off-by: NPierre Habouzit <madcoder@debian.org> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>