Bug 676544 - fails to build with --without-sax1

Added some ifdef'd LIBXML_SAX1_ENABLED to make it buildable with
--without-sax1 configure option.
diff --git a/globals.c b/globals.c
index 69002f0..712f994 100644
--- a/globals.c
+++ b/globals.c
@@ -509,7 +509,7 @@
 #if defined(LIBXML_DOCB_ENABLED) && defined(LIBXML_LEGACY_ENABLED) && defined(LIBXML_SAX1_ENABLED)
     initdocbDefaultSAXHandler(&gs->docbDefaultSAXHandler);
 #endif
-#if defined(LIBXML_HTML_ENABLED) && defined(LIBXML_LEGACY_ENABLED)
+#if defined(LIBXML_HTML_ENABLED) && defined(LIBXML_LEGACY_ENABLED) && defined(LIBXML_SAX1_ENABLED)
     inithtmlDefaultSAXHandler(&gs->htmlDefaultSAXHandler);
 #endif