packages/HaikuSource: Place sources into develop/sources.

Fixes #14781.

HaikuSource: Add missing SEARCH.

build: Add a haiku_source package.

This contains the contents of Haiku's sources, which is necessary
to include in "with source" builds for proper (L)GPL compliance,
mostly because we have GPL code

build: Add a haiku_source package.

This contains the contents of Haiku's sources, which is necessary
to include in "with source" builds for proper (L)GPL compliance,
mostly because we have GPL code in the tree.

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