Create fallback with old arg_split, incase CommandLineToArgvW is missing.

IPython/utils/_process_win32.py

@@ -151,7 +151,7 b' def getoutput(cmd):'
         out = ''
     return out
 
-
+try:
 CommandLineToArgvW = ctypes.windll.shell32.CommandLineToArgvW
 CommandLineToArgvW.arg_types = [LPCWSTR, POINTER(c_int)]
 CommandLineToArgvW.res_types = [POINTER(LPCWSTR)]
@@ -174,3 +174,28 b' def arg_split(commandline, posix=False):'
     result = [arg for arg in result_array_type.from_address(result_pointer)]
     retval = LocalFree(result_pointer)
     return result
+except AttributeError:
+    import shlex
+    #alternative if CommandLineToArgvW is not available
+    def arg_split(s, posix=False):
+        """Split a command line's arguments in a shell-like manner.
+
+        This is a modified version of the standard library's shlex.split()
+        function, but with a default of posix=False for splitting, so that quotes
+        in inputs are respected."""
+
+        # Unfortunately, python's shlex module is buggy with unicode input:
+        # http://bugs.python.org/issue1170
+        # At least encoding the input when it's unicode seems to help, but there
+        # may be more problems lurking.  Apparently this is fixed in python3.
+        is_unicode = False
+        if (not py3compat.PY3) and isinstance(s, unicode):
+            is_unicode = True
+            s = s.encode('utf-8')
+        lex = shlex.shlex(s, posix=posix)
+        lex.whitespace_split = True
+        tokens = list(lex)
+        if is_unicode:
+            # Convert the tokens back to unicode.
+            tokens = [x.decode('utf-8') for x in tokens]
+        return tokens