eclipse-archived/ceylon#6169 (NoClassDefFoundError for remote reposit…

…ory):

Ignore local artifacts when building with tycho, to make the Build more
independent from locally installed artifacts (mainly previous versions).

build.xml

@@ -32,8 +32,9 @@
         <echo>${ceylon.ant.lib}</echo>
         <exec executable="mvn${batExt}" dir="${basedir}" failonerror="true">
             <arg value="clean" />
-            <arg value="install" />
-            <arg value="-DskipTests" />
+        	<arg value="install" />
+            <arg value="-Dtycho.localArtifacts=ignore" />
+        	<arg value="-DskipTests" />
             <arg value="-Dbuild-against=${build-against}"/>
             <arg value="-Dceylon.executable=${ceylon.executable}" />
             <arg value="-Dceylon.ant.lib=${ceylon.ant.lib}"/>