handle monorepo license files specified in project() via ../

We should simply remap these to elide the ../ as it's pretty obviously
the natural expectation of using ../ to fetch files from outside the
project and then drop them *into* the project.

Monorepos will likely have a single license file (or set) under which
the monorepo is licensed. But there will be many components, each of
which may use a different build system, which are "standalone" for the
most part. We already support this case as long as you build from the
monorepo, but the resulting license file gets installed to

```
{licensedir}/../
```

which is silly and unhelpful.

Bug: https://github.com/apache/arrow/issues/36411

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