Fix for Julia 0.6

Author: tkf

julia/pyjulia_helper.jl

@@ -20,10 +20,16 @@ const orig_stdout = Ref{IO}()
 const orig_stderr = Ref{IO}()
 
 function __init__()
+@static if VERSION < v"0.7-"
+    orig_stdin[]  = STDIN
+    orig_stdout[] = STDOUT
+    orig_stderr[] = STDERR
+else
     orig_stdin[]  = stdin
     orig_stdout[] = stdout
     orig_stderr[] = stderr
 end
+end
 
 """
     num_utf8_trailing(d::Vector{UInt8})