Travis CI: Reduce git clone depth
diff --git a/.travis.yml b/.travis.yml
index a2265ce..29e8242 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -82,7 +82,7 @@
   - if [ "$TRAVIS_OS_NAME" = osx ]; then brew install libsmi | grep -v '%'; fi
 
 before_script:
-  - 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 "--${REMOTE}-remote" --prefix=/tmp && make && make install); fi
+  - if [ "$BUILD_LIBPCAP" = true ]; then (cd .. && echo '$ git clone [...] libpcap.git' && git clone --depth 3 --branch=master --quiet git://github.com/the-tcpdump-group/libpcap.git && cd libpcap && ./configure "--${REMOTE}-remote" --prefix=/tmp && make && make install); fi
 
 script:
   - if [ "$COVERITY_SCAN_BRANCH" = 1 ]; then exit 0; fi