README: add missing libssl-dev and pigz packages in host dependencies
pigz is required for make flash command and libssl-dev is required for kernel compilation.
Signed-off-by: Alexey Klimov alexey.klimov@linaro.org
pigz is required for make flash command and libssl-dev is required for kernel compilation.
Signed-off-by: Alexey Klimov alexey.klimov@linaro.org