Remove not implemented variables

[ima1zumi]

Perhaps these were described as TODO comments, but it is difficult to see that these functions are not available, so they should be removed.

• bind-tty-special-chars
• blink-matching-paren
• byte-oriented
• enable-keypad
• expand-tilde
• history-preserve-point
• horizontal-scroll-mode
• input-meta
• mark-directories
• mark-modified-lines
• mark-symlinked-directories
• match-hidden-files
• meta-flag
• output-meta
• page-completions
• prefer-visible-bell
• print-completions-horizontally
• show-all-if-unmodified
• visible-stats

I confirmed that grep does not hit with either hyphens or underscores.

git grep -e bind-tty-special-chars -e blink-matching-paren -e byte-oriented -e enable-keypad -e expand-tilde -e history-preserve-point -e horizontal-scroll-mode -e input-meta -e mark-directories -e mark-modified-lines -e mark-symlinked-directories -e match-hidden-files -e meta-flag -e output-meta -e page-completions -e prefer-visible-bell -e print-completions-horizontally -e show-all-if-unmodified -e visible-stats

git grep -e bind_tty_special_chars -e blink_matching_paren -e byte_oriented -e enable_keypad -e expand_tilde -e history_preserve_point -e horizontal_scroll_mode -e input_meta -e mark_directories -e mark_modified_lines -e mark_symlinked_directories -e match_hidden_files -e meta_flag -e output_meta -e page_completions -e prefer_visible_bell -e print_completions_horizontally -e show_all_if_unmodified -e visible_stats

[tompng]

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