[OE-core] [oe-core master] wayland: add necessary dependencies to fix build error

[Burton, Ross]

On 11 April 2013 09:31, Zhenhua Luo <zhenhua.luo at freescale.com> wrote:
> add libffi into DEPENDS to fix following build error:
> | checking for FFI... no
> | configure: error: Package requirements (libffi) were not met:
> |
> | No package 'libffi' found
>
> Signed-off-by: Zhenhua Luo <zhenhua.luo at freescale.com>

Signed-off-by: Ross Burton <ross.burton at intel.com>