Here is a patch which works under Linux. Under Windows it doesn't choke
when converting arguments anymore, but it fails later in the process (in
the parser for '-c', in the importing logic for '-m').

Here is an example:

$ ./python -c "print(ord('ሀ'))"
4608
$ cat > ሀ.py
print(__file__)

$ ./python -m ሀ
/home/antoine/py3k/mbstowcs/ሀ.py
$ ./python ሀ.py 
ሀ.py