Brotli #1150

[atkawa7]

Created a brotli port file

[msftclas]

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[msftclas]

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[ras0219-msft]

Hi @atkawa7, thanks for the PR!

I switched the portfile to use vcpkg_from_github instead of manually invoking git -- this tends to be much more stable with regards to updates.

I also moved the revision back to the latest release (0.6.0). You can still access the latest master by doing install --head.