urlmon: added the IInternetProtocolEx and IUri interfaces.

[Reece Dunn]

This adds IE7 interfaces needed by the urlmon:protocol tests when IE7
is installed (http://test.winehq.org/data/b3f4091b47e70681a9909bfccd19dee95657fabd/vista_APetacciaVistaNXSet/urlmon:protocol.html).

NOTE: This only adds the interface being queried for
(IInternetProtocolEx - found via google ^_^), an interface it uses
(IUri) and an enumeration used by IUri (Uri_PROPERTY) to urlmon.idl.
It does not fix the test.

- Reece
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