Suppress spurious gettext headers in --help output

Some of man-db's commands have post-options help text but no pre-options
help text.  Unfortunately, the way this works in argp (separating the
two sections using a '\v' character) means that this results in argp
trying to translate the empty string, which produces gettext catalog
headers.  The easiest way to suppress this odd behaviour seems to be to
use a help filter function, so do that.

Reported by Rafael Fontenelle.

* src/accessdb.c (help_filter): Return NULL for ARGP_KEY_HELP_PRE_DOC.
* src/lexgrog_text.c (help_filter): New function.
(argp): Add help_filter.
* src/whatis.c (help_filter): New function.
(apropos_argp): Add help_filter.
* NEWS: Document this.

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