quilt: added less to RDEPENDS list

quilt: added less to RDEPENDS list

The quilt "series" option relies on "less -R" but, since that
option is not enabled by busybox in oe-core by default,
hard-code the dependency on 'less'.

>From 'man less':
   -r or --raw-control-chars
      Causes "raw" control characters to be displayed. ...
   -R or --RAW-CONTROL-CHARS
      Like -r, but only ANSI "color" escape sequences are
      output in "raw" form.  ...

In 2018, BusyBox's less added:
   8528d3d4f less: optional support of -R
but it is not enable by default for oe-core. While we could
enable the option, all known use-cases involve larger, more
developer-oriented recipes such as quilt or man pages.

(From OE-Core rev: 64f9fd2a1ebfad102140801f8be8b8be33082d61)

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>