Autobuilder workers were non-deterministically enabling capstone
depending on whether the worker had libcapstone installed.
Add PACKAGECONFIG for capstone with default off, since ruby does not
require capstone support.
(From OE-Core rev: a43568be9def6de5a0105a822a79c3c07716ec9c)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>