Enable LMDB in Travis CI configuration

LMBD is not built by default since 6143eb9,
so add explicit --with-lmdb configuration.

Missing --with-lmdb build allowed a bug in PR #2003 to pass
through, causing issue #2008.

Author: WGH-

.travis.yml

@@ -26,7 +26,7 @@ env:
   - OPTS="--without-curl $OPTS"
   - OPTS="--without-yajl $OPTS"
   - OPTS="--without-geoip $OPTS"
-  - OPTS="--without-lmdb $OPTS"
+  - OPTS="--with-lmdb $OPTS"
   - OPTS="--without-ssdeep $OPTS"
   - OPTS="--without-lua $OPTS"
   - OPTS="--without-maxmind $OPTS"
@@ -36,6 +36,7 @@ before_script:
   - '[ "$TRAVIS_OS_NAME" != osx ] || brew update'
   - '[ "$TRAVIS_OS_NAME" != osx ] || brew install cppcheck'
   - '[ "$TRAVIS_OS_NAME" != osx ] || brew install libmaxminddb'
+  - '[ "$TRAVIS_OS_NAME" != osx ] || brew install lmdb'
   - '[ "$TRAVIS_OS_NAME" != linux ] || sudo add-apt-repository --yes ppa:maxmind/ppa'
   - '[ "$TRAVIS_OS_NAME" != linux ] || sudo apt-get update'
   - '[ "$TRAVIS_OS_NAME" != linux ] || sudo apt-cache search maxmind'