Merge pull request from GHSA-jvf6-h9gj-pmj6

Merge pull request from GHSA-jvf6-h9gj-pmj6

* Add slash prefix to path-rootless or path-noscheme URLs

* Update src/anyp/Uri.cc

Co-authored-by: Alex Rousskov <rousskov@measurement-factory.com>
* restore file trailer GH auto-removes

* Remove redundant path-empty check

* Removed stale comment left behind by b2ab59a

Many things imply a leading `/` in a URI. Their enumeration is likely to
(and did) become stale, misleading the reader.

* fixup: Remind that the `src` iterator may be at its end

We are dereferencing `src` without comparing it to `\0`.
To many readers that (incorrectly) implies that we are not done iterating yet.

Also fixed branch-added comment indentation.

Co-authored-by: Alex Rousskov <rousskov@measurement-factory.com>