Fix Travis windows build

.travis.yml

@@ -81,10 +81,10 @@ before_install:
 - ./tools/install-flatbuf.sh
 - export CLASSPATH=`pwd`/flatbuffers/java
 # Travis does not set JAVA_HOME on MacOS
-- if [ `uname -s` = Darwin ]; then export JAVA_HOME=`/usr/libexec/java_home`; fi  
+- if [ `uname -s` = Darwin ]; then export JAVA_HOME=`/usr/libexec/java_home`; fi
 # Install Java on Windows (Travis currently does not support Java in the Windows
 # environment).
-- if ( [ "$(uname)" != "Darwin" ] && [ "$(uname)" != "Linux" ] ); then export JAVA_HOME=${JAVA_HOME:-/c/jdk} && export PATH=${JAVA_HOME}/bin:${PATH} && choco install jdk8 -params 'installdir=c:\\jdk' -y; fi
+- if ( [ "$(uname)" != "Darwin" ] && [ "$(uname)" != "Linux" ] ); then export JAVA_HOME=${JAVA_HOME:-/c/jdk} && export PATH=${JAVA_HOME}/bin:${PATH} && choco install jdk8 -params 'installdir=c:\\jdk' -y; choco install make; fi
 #- if [ `uname -s` = Darwin -a x${TOOL} = xrun_souffle_tests ]; then brew install subversion; fi
 
 install: