gcc: depend on zstd-native

gcc: depend on zstd-native

Sharing sstate cache binaries between two systems, one with libzstd installed
and the other without, leads to various gcc components being linked against
the system libzstd and failing to run on the system with out it installed.

Make zstd-native from our system available.

Signed-off-by: Jeremy A. Puhlman <jpuhlman@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 2b0a6f03137f24b211c8881cebf65732e550a942)
Signed-off-by: Steve Sakoman <steve@sakoman.com>