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Yukihiro "Matz" Matsumoto
e7f5387f5d
67f137e201 introduced spec.hal_pattern on the target gem to
declare its expected HAL provider names. But the decision to
override is naturally an opt-in choice belonging to the external
HAL gem (or build_config), not the target. Drop hal_pattern and
hardcode the naming rule in resolve_external_hal!: a gem named
`hal-<short>-<conf>` overrides the gem whose last `-`-separated
segment is <short>. No spec attribute on the target gem; no flag
on add_dependency; the convention does all the work.
The pre-be6413f0d8 convention was `hal-<platform>-<gem>` (e.g.,
hal-posix-task) for platform sort across gems. Now that the
common platforms live under ports/, sorting by which target gem
a HAL is for is more useful, so the order is reversed:
`hal-<gem>-<conf>` (e.g., hal-task-glib).
ref #6825
Co-authored-by: Claude <noreply@anthropic.com>