cdrkit: add zlib select
It's inconsistent with it's DEPENDENCIES otherwise, fixes:
http://autobuild.buildroot.net/results/ac1/ac1e671dcd66c3823cf2e289604ed56f14f7161e/
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>