Add Crystal.once_init replacing __crystal_once_init
#15371
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Prefer a def explictly called by `Crystal.init_runtime` over the implicit `__crystal_once_init` fun injected by the compiler. The fun is no longer defined for new compiler builds, however it's still defined to support older compiler releases.
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straight-shoota
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Crystal.once_init methodCrystal.once_init replacing __crystal_once_init
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Adds
Crystal.once_initthat allows to remove theCrystal.once_mutex=setter.It also removes the need for the
__crystal_once_initfun that won't be defined anymore —it's only kept for the legacy implementation. This is one less compiler dependency on runtime.Follow up to #15369