Handle Rack multivalue headers correctly

Rack uses a single newline character to represent multi-value
headers.  Thus { 'Set-Cookie' => "foo=bar\nbar=foo" }
will get you:

  Set-Cookie: foo=bar
  Set-Cookie: bar=foo

While RFC2616 says you can combine headers as:

  Set-Cookie: foo=bar,bar=foo

There are probably HTTP clients out there that don't handle
things correctly so don't bother...

Additionally, don't bother doing duplicate suppression anymore.
Just assume Rack or a higher layer knows what it's doing
regarding duplicates and we'll get a Hash most of the time
anyways.

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