[libxml2] Remove htmlDefaultSAXHandler from non-SAX1 build

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 4b184240beaaccab7e639205ed52536cd02e78af
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Aug 22 14:11:15 2022 +0200

    Remove htmlDefaultSAXHandler from non-SAX1 build
    
    This matches long-standing behavior of the XML counterpart.

 HTMLparser.c | 2 ++
 SAX2.c       | 2 ++
 globals.c    | 4 ++--
 3 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/HTMLparser.c b/HTMLparser.c
index 4d2a343e..b270ce46 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -6338,7 +6338,9 @@ htmlCreatePushParserCtxt(htmlSAXHandlerPtr sax, void *user_data,
     if(enc==XML_CHAR_ENCODING_UTF8 || buf->encoder)
        ctxt->charset=XML_CHAR_ENCODING_UTF8;
     if (sax != NULL) {
+#ifdef LIBXML_SAX1_ENABLED
        if (ctxt->sax != (xmlSAXHandlerPtr) &htmlDefaultSAXHandler)
+#endif
            xmlFree(ctxt->sax);
        ctxt->sax = (htmlSAXHandlerPtr) xmlMalloc(sizeof(htmlSAXHandler));
        if (ctxt->sax == NULL) {
diff --git a/SAX2.c b/SAX2.c
index ec89046b..36f74f24 100644
--- a/SAX2.c
+++ b/SAX2.c
@@ -2998,7 +2998,9 @@ xmlSAX2InitHtmlDefaultSAXHandler(xmlSAXHandler *hdlr)
 void
 htmlDefaultSAXHandlerInit(void)
 {
+#ifdef LIBXML_SAX1_ENABLED
     xmlSAX2InitHtmlDefaultSAXHandler((xmlSAXHandlerPtr) &htmlDefaultSAXHandler);
+#endif
 }
 
 #endif /* LIBXML_HTML_ENABLED */
diff --git a/globals.c b/globals.c
index a15ac305..5e42f193 100644
--- a/globals.c
+++ b/globals.c
@@ -405,7 +405,7 @@ xmlSAXLocator xmlDefaultSAXLocator = {
     xmlSAX2GetColumnNumber
 };
 
-#ifdef LIBXML_HTML_ENABLED
+#if defined(LIBXML_HTML_ENABLED) && defined(LIBXML_SAX1_ENABLED)
 /**
  * htmlDefaultSAXHandler:
  *
@@ -667,7 +667,7 @@ xmlThrDefOutputBufferCreateFilenameDefault(xmlOutputBufferCreateFilenameFunc fun
     return(old);
 }
 
-#ifdef LIBXML_HTML_ENABLED
+#if defined(LIBXML_HTML_ENABLED) && defined(LIBXML_SAX1_ENABLED)
 #undef htmlDefaultSAXHandler
 xmlSAXHandlerV1 *
 __htmlDefaultSAXHandler(void) {