The singal_blocker introduced sicne 3.39.6 will cause random block when app startup on android platform

[halx99]

refer to:

• https://github.com/yasio/yasio/blob/v3.39.6/yasio/detail/signal_blocker.hpp
• https://github.com/chriskohlhoff/asio/blob/master/asio/include/asio/detail/posix_signal_blocker.hpp