Portably avoid overrides of $*OUT/$*ERR in Test.pm

This replaces an unportable attempt to do so. PROCESS is populated
with The Real Thing at startup, and any userland overrides will be
done with dynamic variables. Thus this achieves the desired effect
with much less code and without blowing up on Windows.

lib/Test.pm

@@ -22,22 +22,10 @@ my $die_on_fail;
 my $time_before;
 my $time_after;
 
-# handles
-my $output         = $*OUT;
-my $failure_output = $*ERR;
-my $todo_output    = $*OUT;
-
-try {
-    # XXX do this with dup or an analogous cross-platform construct
-    # XXX these should probably have :autoflush
-    my $output_h         = open('/dev/stdout', :w);
-    my $failure_output_h = open('/dev/stderr', :w);
-    my $todo_output_h    = open('/dev/stdout', :w);
-
-    ( $output, $failure_output, $todo_output ) = ( $output_h, $failure_output_h, $todo_output_h );
-
-    CATCH {}
-}
+# Output should always go to real stdout/stderr, not to any dynamic overrides.
+my $output         = $PROCESS::OUT;
+my $failure_output = $PROCESS::ERR;
+my $todo_output    = $PROCESS::OUT;
 
 ## If done_testing hasn't been run when we hit our END block, we need to know
 ## so that it can be run. This allows compatibility with old tests that use