Fix compilation problem

Author: cowtowncoder

src/main/java/tools/jackson/dataformat/xml/ser/ToXmlGenerator.java

@@ -278,6 +278,11 @@ public ToXmlGenerator configure(XmlWriteFeature f, boolean state) {
         return this;
     }
 
+    @Override
+    public boolean has(StreamWriteCapability capability) {
+        return DEFAULT_TEXTUAL_WRITE_CAPABILITIES.isEnabled(capability);
+    }
+    
     @Override
     public JacksonFeatureSet<StreamWriteCapability> streamWriteCapabilities() {
         return DEFAULT_TEXTUAL_WRITE_CAPABILITIES;