thirdparty: fix build failure on boost-1.68 enviroment

[neverchanje]

In file included from /home/wutao1/work/boost_1_68_0/output/include/boost/asio.hpp:118:0,
                 from /home/wutao1/work/pegasus-boost68/src/reporter/pegasus_counter_reporter.h:11,
                 from /home/wutao1/work/pegasus-boost68/src/server/info_collector_app.cpp:6:
/home/wutao1/work/boost_1_68_0/output/include/boost/asio/signal_set.hpp:114:58: error: macro "signal_set" requires 4 arguments, but only 1 given
   explicit signal_set(boost::asio::io_context& io_context)
                                                          ^
/home/wutao1/work/boost_1_68_0/output/include/boost/asio/signal_set.hpp:132:70: error: macro "signal_set" requires 4 arguments, but only 2 given
   signal_set(boost::asio::io_context& io_context, int signal_number_1)
                                                                      ^
/home/wutao1/work/boost_1_68_0/output/include/boost/asio/signal_set.hpp:157:26: error: macro "signal_set" requires 4 arguments, but only 3 given
       int signal_number_2)
                          ^
/home/wutao1/work/boost_1_68_0/output/include/boost/asio/signal_set.hpp:205:15: error: macro "signal_set" requires 4 arguments, but only 1 given
   ~signal_set()