xinhaiteng dbefe37a3a sigqueue: add signal type judgment logic
To determine whether a signal is real-time signal or standard signal, the POSIX standard https://www.man7.org/linux/man-pages/man7/signal.7.html defines a real-time signal between SIGRTMIN  and SIGRTMAX , which can store multiple copies, otherwise only one can be retained.

Signed-off-by: xinhaiteng <xinhaiteng@xiaomi.com>
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