ld bootstrap test in build dir with path containing symlinks

This allows the bootstrap test to run if you have a symlink somewhere
in the build path directory.  $ld depends on $base_dir which is set
via tcl [pwd], collapsing the symlink like /usr/bin/pwd, while $objdir
contains the symlink.

	* testsuite/ld-bootstrap/bootstrap.exp: Normalize paths when
	checking for ld build directory.

ld/testsuite/ld-bootstrap/bootstrap.exp

@@ -106,7 +106,7 @@ foreach flags $test_flags {
 
     # This test can only be run if we have the ld build directory,
     # since we need the object files.
-    if {$ld != "$objdir/ld-new"} {
+    if {[file normalize $ld] != [file normalize $objdir/ld-new]} {
 	untested $testname
 	continue
     }