Prevent compiling with PHP 8.1+

Update based on php-src implementation

Fix hidden exception from suspend in force closed fiber

(EG(flags) & EG_FLAGS_IN_SHUTDOWN) cannot be used as a replacement for FIBER_G(shutdown) because it prevents fibers being resumed in a

Fix hidden exception from suspend in force closed fiber

(EG(flags) & EG_FLAGS_IN_SHUTDOWN) cannot be used as a replacement for FIBER_G(shutdown) because it prevents fibers being resumed in a shutdown function.

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Switch to {main} for fatal errors

Remove root context

Update file header

Thanks to Martin Schröder for the original code and inspiration, but I should be the main contact for questions and maintance of this code. Very little of the original cod

Update file header

Thanks to Martin Schröder for the original code and inspiration, but I should be the main contact for questions and maintance of this code. Very little of the original code remains unchanged.

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Remove root context

Update file header

Thanks to Martin Schröder for the original code and inspiration, but I should be the main contact for questions and maintance of this code. Very little of the original cod

Update file header

Thanks to Martin Schröder for the original code and inspiration, but I should be the main contact for questions and maintance of this code. Very little of the original code remains unchanged.

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Restore Fiber::this()

Plus cleaned up some now unnecessary code.

Drop FiberScheduler

Fix build as in-tree component of php-src