lz4: Disable static libraries again
This option was incorrectly removed in the recent upgrade. We don't use/need
the static library so disable the build of it to save time/disk usage.
(From OE-Core rev: 2ba36d98bb0fcdd8d918da8fb69f09a06b75fd46)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>