Add a workaround to the encoding problem from polyglot

See takari/polyglot-maven#259

tycho-extras/tycho-pomless/src/main/java/org/eclipse/tycho/pomless/TychoTeslaModelProcessor.java

@@ -0,0 +1,38 @@
+package org.eclipse.tycho.pomless;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.util.Map;
+
+import javax.annotation.Priority;
+
+import org.apache.maven.model.Model;
+import org.apache.maven.model.building.ModelProcessor;
+import org.apache.maven.model.io.ModelParseException;
+import org.codehaus.plexus.component.annotations.Component;
+import org.codehaus.plexus.util.ReaderFactory;
+import org.sonatype.maven.polyglot.TeslaModelProcessor;
+
+//This is a hack until https://github.com/takari/polyglot-maven/pull/259 is fixed 
+@Component(role = ModelProcessor.class)
+@Priority(10)
+public class TychoTeslaModelProcessor extends TeslaModelProcessor {
+    @Override
+    public Model read(final File input, final Map<String, ?> options) throws IOException, ModelParseException {
+        Model model;
+        try (Reader reader = ReaderFactory.newXmlReader(input)) {
+            model = read(reader, options);
+            model.setPomFile(input);
+        }
+        return model;
+    }
+
+    @Override
+    public Model read(final InputStream input, final Map<String, ?> options) throws IOException, ModelParseException {
+        try (Reader reader = ReaderFactory.newXmlReader(input)) {
+            return read(reader, options);
+        }
+    }
+}