bind: Include dnssec-settime in bind-dnssec/tool

<net/bind>

Maintainer: @nmeyerhans
Compile tested: x86_64, OpenWRT 50107
Run tested: x86 / 64, OpenWRT 50107

Description:

Added dnssec-settime into bind-dnssec and bind-tools

Signed-off-by: Sami Olmari <sami+git@olmari.fi>