RFR: 8366255: Remove 'package_to_module' function from imageFile.cpp

[duke]

On Wed, 27 Aug 2025 17:44:04 GMT, David Beaumont <duke at openjdk.org> wrote:

> Removing the 'package_to_module' function from imageFile.cpp and the associated JNI export.
> This code isn't used or referenced from anywhere, and removing it makes adapting the package flags for use with preview mode simpler.
> 
> A clone of the Valhalla PR:
> https://github.com/openjdk/valhalla/pull/1535

@david-beaumont 
Your change (at version 7d92134a622d0a1ca05d0e0c3d915489c5517da2) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/26965#issuecomment-3229824162