Updated go bootstrap for mender

mender.xml

@@ -17,7 +17,7 @@
  <target name="build-go">
   <property name="makedir" value="${builddir}/go"/>
   <exec executable="tar" failonerror="true">
-   <arg line="xf ${basedir}/build-system/packages/go/go1.4-bootstrap-20170531.tar.gz -C ${builddir}"/>
+   <arg line="xf ${basedir}/build-system/packages/go/go1.4-bootstrap-20171003.tar.gz -C ${builddir}"/>
   </exec>
   <exec executable="./make.bash" dir="${makedir}/src"/>
   <move file="${builddir}/go" tofile="${builddir}/go1.4"/>