Force IPv4 for Travis (it has issues with IPv6 resolver)

Signed-off-by: Peter Lemenkov <[email protected]>

Author: lemenkov

scripts/do-test.sh

@@ -9,7 +9,7 @@ autoreconf --force --install --verbose
 ./configure
 make
 make clean
-sudo DEBIAN_FRONTEND=noninteractive apt-get install libgsm1-dev libsndfile1-dev tcpdump
+sudo DEBIAN_FRONTEND=noninteractive apt-get -o Acquire::ForceIPv4=true install libgsm1-dev libsndfile1-dev tcpdump
 tcpdump --version || true
 mkdir deps
 cd deps