PATCH: remove call to obsolete dejagnu proc

[Ben Elliston]

In DejaGnu 1.6, the utility procedure 'absolute' has been removed as
it can be implemented with Tcl's own 'file normalize' command.  Okay
to commit?

2016-04-20  Ben Elliston  <bje@gnu.org>

	    * testsuite/lib/libjava.exp (libjava_arguments): Use 'file
	    normalize' rather than the defunct DejaGnu 'absolute' proc.

Index: testsuite/lib/libjava.exp
===================================================================
--- testsuite/lib/libjava.exp	(revision 235209)
+++ testsuite/lib/libjava.exp	(working copy)
@@ -416,7 +416,7 @@
 
     # Search for libtool.  We need it to link.
     set found_compiler 0
-    set d [absolute $objdir]
+    set d [file normalize $objdir]
     foreach x {. .. ../.. ../../..} {
     if {[file exists $d/$x/libtool]} then {
         # We have to run silently to avoid DejaGNU lossage.
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