globals: Remove unused globals from thread storage

Setting these deprecated globals hasn't had an effect for a long time.
Make them constants. This reduces the size of per-thread storage from
~700 to ~250 bytes.

include/libxml/HTMLparser.h

@@ -80,22 +80,17 @@ struct _htmlEntityDesc {
     const char *desc;   /* the description */
 };
 
-/** DOC_DISABLE */
 #ifdef LIBXML_SAX1_ENABLED
-  #define XML_GLOBALS_HTML \
-    XML_OP(htmlDefaultSAXHandler, xmlSAXHandlerV1, XML_DEPRECATED)
-#else
-  #define XML_GLOBALS_HTML
+
+XML_DEPRECATED
+XMLPUBVAR const xmlSAXHandlerV1 htmlDefaultSAXHandler;
+
+#ifdef LIBXML_THREAD_ENABLED
+XML_DEPRECATED
+XMLPUBFUN const xmlSAXHandlerV1 *__htmlDefaultSAXHandler(void);
 #endif
 
-#define XML_OP XML_DECLARE_GLOBAL
-XML_GLOBALS_HTML
-#undef XML_OP
-
-#if defined(LIBXML_THREAD_ENABLED) && !defined(XML_GLOBALS_NO_REDEFINITION)
-  #define htmlDefaultSAXHandler XML_GLOBAL_MACRO(htmlDefaultSAXHandler)
-#endif
-/** DOC_ENABLE */
+#endif /* LIBXML_SAX1_ENABLED */
 
 /*
  * There is only few public functions.
@@ -333,11 +328,5 @@ XMLPUBFUN htmlStatus htmlNodeStatus(htmlNodePtr, int) ;
 }
 #endif
 
-#else /* LIBXML_HTML_ENABLED */
-
-/** DOC_DISABLE */
-#define XML_GLOBALS_HTML
-/** DOC_ENABLE */
-
 #endif /* LIBXML_HTML_ENABLED */
 #endif /* __HTML_PARSER_H__ */