[PATCH] xmllite: Parse URLs in `DOCTYPE PUBLIC` DTDs.

[Grant Paul]

Before, a common DOCTYPE header like this one would fail to parse:

    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">

This is because the URL field was only handled for `DOCTYPE SYSTEM`,
and not `DOCTYPE PUBLIC`, which can have both an identifier and a URL.

Tested on macOS.

Signed-off-by: Grant Paul <git at grantpaul.com>
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