Compatibility fix for Octave 5

The sleep() function has been removed in favor of pause().

tests/run_block_byte_tests_octave.m

-## Copyright (C) 2009-2017 Dynare Team
+## Copyright (C) 2009-2019 Dynare Team
 ##
 ## This file is part of Dynare.
 ##
@@ -56,7 +56,7 @@ for blockFlag = 0:1
             stack_solve_algos = 0:5;
         endif
 
-        sleep(1) # Workaround for strange race condition related to the _static.m file
+        pause(1) # Workaround for strange race condition related to the _static.m file
 
         for i = 1:length(solve_algos)
             num_block_tests = num_block_tests + 1;