Python: fixed deprecated cosntruct

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_Python/compile_mex_functions.py

@@ -214,7 +214,7 @@ class MexBuilder(object):
             cmd.append("-largeArrayDims")
         cmd.append("-lut")
         #         cmd.append("-largeArrayDims") # This unfortunately conflicts with mym.cpp
-        self.out.printSubSubJob("File", cmd[1] + " (cmd: " + string.join(cmd, " ") + " )")
+        self.out.printSubSubJob("File", cmd[1] + " (cmd: " + " ".join(cmd) + " )")
         return subprocess.call(cmd)
 
     def compile_mex_files(self):