Fix handling of namespace reexports when preserving modules

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

• resolves Build fails in rollup@3.8.0 when using resolve() and preserveModules #4765

Description

Apparently, one assumption from me was wrong about what does or does not occur in a chunks dependencies.

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-4765-namespace-reexport

or load it into the REPL:
https://rollupjs.org/repl/?pr=4766

[codecov]

Codecov Report

Merging #4766 (22283f4) into master (1243370) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4766   +/-   ##
=======================================
  Coverage   99.03%   99.03%           
=======================================
  Files         217      217           
  Lines        7762     7764    +2     
  Branches     2148     2149    +1     
=======================================
+ Hits         7687     7689    +2     
  Misses         24       24           
  Partials       51       51           

Impacted Files	Coverage Δ
src/Chunk.ts	99.82% <100.00%> (+<0.01%)	⬆️

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[rollup-bot]

This PR has been released as part of rollup@3.8.1. You can test it via npm install rollup.