disable invalid aliases to undefined symbols.

--- libxml2-2.6.18/elfgcchack.h.orig	2005-03-08 14:57:55.000000000 +0100
+++ libxml2-2.6.18/elfgcchack.h	2005-03-22 15:29:41.000000000 +0100
@@ -55,6 +55,7 @@
 #include "libxml/xpointer.h"
 #include "libxml/xmlmodule.h"
 
+#if 0
 /* special hot spot not exported ones */
 
 extern __typeof (__xmlGenericError) __xmlGenericError__internal_alias __attribute((visibility("hidden")));
@@ -7841,3 +7842,4 @@
 #define xmlXPtrWrapLocationSet xmlXPtrWrapLocationSet__internal_alias
 #endif
 
+#endif /* #if 0 */