Hiroshi SHIBATA 2f3cdc0a1c Fix callcc availability checks in tests
`callcc` is a private global function, so `respond_to?(:callcc)` is always false and these tests have been skipped since 5621d794a2. Builds that disable `callcc` still skip them, because `respond_to?` returns false for not-implemented methods even with `include_all`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit 3a3a921ac6c02b4269a2c6d4c6cb30d06fa6892e)
2026-11-06 22:34:39 +09:00
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2026-03-07 14:50:06 +09:00
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