crda: needs threads

Because libnl needs threads, fixes:
http://autobuild.buildroot.net/results/8e32f222ddeba262ee2471d22e1c6a8afbf241c2/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
1 file changed