daq: fix compilation

preset paths to remove that error:
/meta-oe/recipes-connectivity/daq/daq_2.0.2.bb
./config.log:cc1: warning: include location "/usr/local/include" is unsafe for cross-compilation [-Wpoison-system-directories]

Also this patch add required libdnet dependency.

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>