FOP-2107: org.apache.batik.bridge.BridgeException: Unable to make sense of URL for connection; patch suggested by Matthias Reischenbacher and Robert Meyer comments.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1526329 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/apps/FOUserAgent.java

         try {
             // Have to do this so we can resolve data URIs
             StreamSource src = new StreamSource(resourceResolver.getResource(uri));
-            src.setSystemId(uri);
+            src.setSystemId(new File(uri).toURI().toURL().toExternalForm());
             return src;
         } catch (URISyntaxException use) {
             return null;