ext/posix: adding POSIX_SC_OPEN_MAX constant.

returns the number of file descriptors that a process can handle.
e.g. useful after pcntl_fork() to close all the file descriptors up
to

ext/posix: adding POSIX_SC_OPEN_MAX constant.

returns the number of file descriptors that a process can handle.
e.g. useful after pcntl_fork() to close all the file descriptors up
to that boundary.

close GH-16681

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posix add sysconf call.

providing handful of common and most used constants.

Closes GH-9481.