util: Move pipe_semaphore to u_thread.h and rename it to util_semaphore
cc @jenatali This is an alternative way for !19522 (merged)
Signed-off-by: Yonggang Luo luoyonggang@gmail.com
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cc @jenatali This is an alternative way for !19522 (merged)
Signed-off-by: Yonggang Luo luoyonggang@gmail.com