These two packages are required for all the supported distros
if you are going to build the BitBake manual.
(From yocto-docs rev: 76b19462aa1dd850c00b7addccdafcc0f1a67e1c)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>