SCons.Util.Flatten does not support Python3's dictionary view objects

I've been testing SCons with Python3 and have run into some trouble
using the Depends builder. My dependency sources are the values of a
dictionary and I'm passing the result of dict.values() to Depends.

resources = {
    'icon': 'resources/icon.png',
    'splash': 'resources/splash.png',
}
env.Depends(myprog, resources.values())

When run under Python3, SCons fails to build with the following traceback:
AttributeError: 'dict_values' object has no attribute 'get_state':
  File "/usr/local/lib/scons/SCons/Script/Main.py", line 1361:
    _exec_main(parser, values)
  File "/usr/local/lib/scons/SCons/Script/Main.py", line 1324:
    _main(parser)
  File "/usr/local/lib/scons/SCons/Script/Main.py", line 1103:
    nodes = _build_targets(fs, options, targets, target_top)
  File "/usr/local/lib/scons/SCons/Script/Main.py", line 1298:
    jobs.run(postfunc = jobs_postfunc)
  File "/usr/local/lib/scons/SCons/Job.py", line 111:
    self.job.start()
  File "/usr/local/lib/scons/SCons/Job.py", line 193:
    task = self.taskmaster.next_task()
  File "/usr/local/lib/scons/SCons/Taskmaster.py", line 960:
    node = self._find_next_ready_node()
  File "/usr/local/lib/scons/SCons/Taskmaster.py", line 851:
    childstate = child.get_state()


In python 3, dict.values() returns a dictionary view object:
https://docs.python.org/3/library/stdtypes.html#dictionary-view-objects

The problem starts with a lack of support for these dictionary views
in SCons.Util.Flatten:
items = {"a":1, "b":2, "c":3}
args = SCons.Util.Flatten(items.values())
print(args)

result: [dict_values([2, 1, 3])]

Thanks,
Mike Haboustak
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