Make tests pass when PERL_USE_UNSAFE_INC=0

Author: Leont

Changes

@@ -1,5 +1,7 @@
 Revision history for Test-Harness
 
+        - Make tests pass when PERL_USE_UNSAFE_INC=0
+
 3.38    13-03-2017
         - Released 3.37_01 without changes
 

t/nofork-mux.t

@@ -8,4 +8,4 @@ use strict;
 use warnings;
 
 use NoFork;
-require('t/multiplexer.t');
+require('./t/multiplexer.t');