MFC r227934: Port to new libdialog.
MFC r246978:
  - Make sure to set an error code when trying to obtain a data descriptor for
    a section of type SHT_NULL.
  - Update the man page to reflect the fact that elf_getdata() and
    elf_rawdata() may return with an error of ELF_E_SECTION.

Approved by:	rstone (co-mentor)
Dummy commit to show r247722 was (in addition to being an MFC for r227934), an
MFC for r227947:

calloc +1 DIALOG_LISTITEM to prevent possible wild pointer access
in dlg_default_listitem().

and also for r228176: Sync xdialog_menu() implementation with sade.
MFC r230299:

Fix #ifdef VERBOSE for UTC case

Update verbose output to match what actually happens when selecting
the UTC option, and when the -n option is used.

Patch updated slightly for new libdialog.

PR:		bin/164042
Submitted by:	dteske