[whatwg/url] Changes to file URL path normalization (#544)

Changes to file URL path normalization as proposed in #405. 

Summary:

Applicable only to file URLs:
- Leading empty path segements are no longer removed. 
- If absent, the host is copied from the base URL,
- Otherwise the host is preserved with one exception:
- If the host is `localhost` then it is set to the empty string. 

Intends to close #405 and #302. 

- Tests: https://github.com/web-platform-tests/wpt/pull/25716. 
- Reference implementation: https://github.com/jsdom/whatwg-url/pull/170.


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  https://github.com/whatwg/url/pull/544

-- Commit Summary --

  * Changes to file URL path normalization

-- File Changes --

    M url.bs (36)

-- Patch Links --

https://github.com/whatwg/url/pull/544.patch
https://github.com/whatwg/url/pull/544.diff

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