coroutine: add support for libucontext
libucontext is a lightweight implementation of ucontext for platforms that do not have a built-in implementation. This allows us to use the same code to support libucontext as ucontext.
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libucontext is a lightweight implementation of ucontext for platforms that do not have a built-in implementation. This allows us to use the same code to support libucontext as ucontext.