Fix: order of imports get mixed-up when removing duplicates.

set() changes the order, use OrderedDict instead.

PyInstaller/depend/modules.py

@@ -16,6 +16,7 @@
 
 import os
 import pkgutil
+from collections import OrderedDict
 
 from PyInstaller.compat import ctypes, PYCO
 from PyInstaller.depend.utils import _resolveCtypesImports, scan_code
@@ -82,9 +83,10 @@ def _remove_duplicate_entries(self, item_list):
         """
         Remove duplicate entries from the list.
         """
-        # The strategy is to convert a list to a set and then back.
-        # This conversion will eliminate duplicate entries.
-        return list(set(item_list))
+        # The strategy is to convert a list to anOrderedDict and then
+        # back. This conversion will eliminate duplicate entries. Do
+        # not use a set, as this will change the order of elements.
+        return list(OrderedDict(map(None, item_list, [])))
 
     def scancode(self):
         self.pyinstaller_imports, self.pyinstaller_warnings, self.pyinstaller_binaries, allnms = scan_code(self.co)