[xml] Tru64 UNIX 4.0D needs RTLD_GLOBAL defined

[Albert Chin <libxml mlists thewrittenword com>]

Tru64 UNIX has dlopen() but no RTLD_GLOBAL.

-- 
albert chin (china thewrittenword com)

-- snip snip
Index: xmlmodule.c
===================================================================
--- xmlmodule.c.orig    2005-07-28 18:58:57.000000000 -0500
+++ xmlmodule.c 2005-10-28 01:07:10.754426000 -0500
@@ -195,6 +195,10 @@
 #include <dlfcn.h>
 #endif
 
+#ifndef RTLD_GLOBAL            /* For Tru64 UNIX 4.0 */
+#define RTLD_GLOBAL 0
+#endif
+
 /**
  * xmlModulePlatformOpen:
  * @name: path to the module