Bug 12328 – [IMPLEMENTATION] Target::critsecsize should be a runtime or library inferred value

This target hook is a pain, as there's no way to reasonably determine what this value should be - isLinux or isLP64 for instance is not enough information because you could be compiling for a setup that uses an alternate threading library, or have disabled threading completely. So I propose that we remove this hook and instead rely on druntime to handle this feature solely, ideally by providing an alternative library call that doesn't require a buffer passed to it.

Fixed in https://github.com/dlang/dmd/pull/11824