nnn: Update to 2.4

Patch provided by Sijmen Mulder via tech-pkg@, thanks!

pkgsrc changes:
 - New 'readline’ option (enabled by default)

Changes:
2.4
---
 - Tinier and lighter!
 - FreeDesktop.org compliant trashing
 - mark selected entries with +
 - wild mode (option -w, key ^W) for nav-as-you-type
 - POSIX-compliant GUI app launcher with drop-down menu (key =)
 - new scripts:
    - upload image to imgur
    - send selection to Android using kdeconnect-cli
 - show permissions in detail mode
 - cp, mv progress bar on Linux (needs advcpmv) [BSD, macOS shows on ^T]
 - make libreadline an optional dep (reduces memory usage)
 - minimize the number of redraws
 - handle screen resize gracefully
 - option -d to show hidden files (NNN_SHOW_HIDDEN is removed)
 - additional key K to toggle selection
 - change visit start dir key to @
 - option -C to disable colors removed
 - per-context initial directory replaced by program start dir
 - marker msg when spawning new shell removed
 - rename debug file to nnndbg

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