fixing compilation bug with some options disabled as well as

* debugXML.c testHTML.c tree.c doc/examples/*.c
  include/libxml/xmlsave.h: fixing compilation bug with some options
  disabled as well as --with-minimum should fix #134695
Daniel
diff --git a/include/libxml/xmlsave.h b/include/libxml/xmlsave.h
index f783ffd..1d43a71 100644
--- a/include/libxml/xmlsave.h
+++ b/include/libxml/xmlsave.h
@@ -14,6 +14,7 @@
 #include <libxml/tree.h>
 #include <libxml/xmlIO.h>
 
+#ifdef LIBXML_OUTPUT_ENABLED
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -54,6 +55,7 @@
 #ifdef __cplusplus
 }
 #endif
+#endif /* LIBXML_OUTPUT_ENABLED */
 #endif /* __XML_XMLSAVE_H__ */