expose xmlTextReaderSetup function

svn path=/trunk/; revision=3571
diff --git a/xmlreader.c b/xmlreader.c
index c8bcf7b..cd32cc3 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -4855,7 +4855,7 @@
  * 
  * Returns 0 in case of success and -1 in case of error.
  */
-static int
+int
 xmlTextReaderSetup(xmlTextReaderPtr reader,
                    xmlParserInputBufferPtr input, const char *URL,
                    const char *encoding, int options)