mausezahn: libcli: add sys/time.h for older libcli versions

Older versions of libcli lack an include in libcli.h. [1] fixed the
configure script to not fail in in the test [2], and an include into
cli.h was added as well for the main mausezahn build.

[1] http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-analyzer/netsniff-ng/files/netsniff-ng-0.5.8-libcli-test.patch?revision=1.1&view=markup
[2] http://b-4.xmw.de/var/log/portage/build/net-analyzer/netsniff-ng-0.5.8_rc2:20130805-055918.log

Reported-by: Michael Weber <michael@xmw.de>
Suggested-by: Michael Weber <michael@xmw.de>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>