Travis: set git clone for libpcap to be faster and quieter
diff --git a/.travis.yml b/.travis.yml
index 84b6c5b..3282c9b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -57,7 +57,7 @@
   - if [ "$TRAVIS_OS_NAME" = osx ]; then brew install libsmi; fi
 
 before_script:
-  - if [ "$BUILD_LIBPCAP" = true ]; then (cd .. && git clone git://github.com/the-tcpdump-group/libpcap.git && cd libpcap && ./configure && make); else sudo apt-get -qq install libpcap-dev; fi
+  - if [ "$BUILD_LIBPCAP" = true ]; then (cd .. && echo '$ git clone [...] libpcap.git' && git clone --depth=50 --branch=master --quiet git://github.com/the-tcpdump-group/libpcap.git && cd libpcap && ./configure && make); else sudo apt-get -qq install libpcap-dev; fi
 
 script:
   - if [ "$COVERITY_SCAN_BRANCH" != 1 ]; then touch .devel configure; fi