daemon: fix parallel build

daemon: fix parallel build

The 'ready' target creates a symlink in the libslack/ subdirectory to make
up the path to header files.  Unfortunately, the target building sources
files that need that symlink, does not depend on the 'ready' target.  This
might break highly parallel builds.  As a workaround make the 'ready' target
before making 'all'.

Should fix:
http://autobuild.buildroot.net/results/ed2/ed21ac166f2151aa69a7790a17ff05f05afa512d/
http://autobuild.buildroot.net/results/333/3338539743c8b0399c6b0fcbbb7c28b58bf3f387/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>