cli: drop _NMC_RL_STARTUPHOOK_ARGS
Summary
Fixes compilation issue with modern C compilers (e.g., https://bugs.gentoo.org/938249).
Checklist
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the subject for all commits is concise and explicative -
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any relevant documentation is up to date -
you have added unit tests if applicable -
the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.