Consider support for wildcard backtracking

[guybedford]

Currently we filter wildcards to ensure they cannot bracktrack. There are cases where this can be useful though, so if it can be supported we should.

[lucleray]

Here's a repro for this:

https://github.com/lucleray/ncc-backtracking-assets

• run ncc build folder/index.js
• dist folder does not contain example

Without backtracking (../) in the path, it works fine.

[guybedford]

A variation of this could be to modify the filter to support backtracking into sibling folders specifically.