travis: criu depends on libcap-dev too

https://travis-ci.org/xemul/criu/jobs/110616491Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/build/Dockerfile.tmpl

@@ -11,7 +11,8 @@ RUN apt-get update && apt-get install -y \
                 libaio-dev \
                 libcap-dev \
                 iptables \
-                libnl-3-dev
+                libnl-3-dev \
+                libcap-dev
 
 COPY . /criu
 WORKDIR /criu