Flush directly to avoid erros when running from test harness

p4raw-id: //depot/perl@16307

ext/threads/shared/t/cond.t

@@ -7,6 +7,7 @@ BEGIN {
         exit 0;
     }
 }
+$|++;
 print "1..5\n";
 use strict;
 

ext/threads/shared/t/queue.t

@@ -15,7 +15,7 @@ use threads;
 use threads::queue;
 
 $q = new threads::shared::queue;
-
+$|++;
 print "1..26\n";
 
 my $test : shared = 1;