Due to syntax differences the latter doesn't really solve the
dependency when we use our build-script.
Instead use the same approach as the libwifi package.
Change-Id: If37b70141b541cca03474251904863a17e07ff45
libethernet requires headers from Broadcom when built for the Broadcom
target. Add build-time dependency when being built for Broadcom.
This fixes a race-condition where the build would fail if bcmkernel
build did not finish before the libethernet build.
Signed-off-by: Andreas Gnau <andreas.gnau@iopsys.eu>
