started integrating the core of the thread support not activated yet but

* Makefile.am include/libxml/Makefile.am
  include/libxml/globals.h globals.c  include/libxml/threads.h
  threads.c build_glob.py global.data xmlcatalog.c acconfig.h
  configure.in: started integrating the core of the thread support
  not activated yet but half integrated. The code should still
  compile and work anyway.
Daniel
diff --git a/config.h.in b/config.h.in
index bf54bc0..83971e4 100644
--- a/config.h.in
+++ b/config.h.in
@@ -15,6 +15,8 @@
 #undef HAVE_LIBHISTORY
 #undef HAVE_LIBREADLINE
 #undef SOCKLEN_T
+#undef HAVE_LIBPTHREAD
+#undef HAVE_PTHREAD_H
 
 /* Define if you have the _stat function.  */
 #undef HAVE__STAT
@@ -91,6 +93,9 @@
 /* Define if you have the <dirent.h> header file.  */
 #undef HAVE_DIRENT_H
 
+/* Define if you have the <dlfcn.h> header file.  */
+#undef HAVE_DLFCN_H
+
 /* Define if you have the <errno.h> header file.  */
 #undef HAVE_ERRNO_H