Fix buildroot.

Change-Id: I902db6c69ae5966da1102e4fbcfd9f46867c0b4f
Reviewed-on: https://code.wireshark.org/review/2762
Reviewed-by: Jeff Morriss <jeff.morriss.ws@gmail.com>
(cherry picked from commit 5f682f1f0329d65edbb363d7db1df23840d38d83)
Reviewed-on: https://code.wireshark.org/review/2764