FIX: disable SIGPIPE on platforms w/SO_NOSIGPIPE
FIX: disable SIGPIPE on platforms w/SO_NOSIGPIPE

The DISABLE_SIGPIPE_WITH_SETSOCKOPT preprocessor define got deleted the
os-layer socket functions were moved to amqp_socket.c. This fixes that.

hjzljp/rabbitmq-c,jqk6/rabbitmq-c,tempbottle/rabbitmq-c,Haster2004/rabbitmq-c,alanxz/rabbitmq-c,kilinrax/rabbitmq-c,alanxz/rabbitmq-c,jqk6/rabbitmq-c,sakishum/rabbitmq-c,sakishum/rabbitmq-c,jqk6/rabbitmq-c,kilinrax/rabbitmq-c,kilinrax/rabbitmq-c,tempbottle/rabbitmq-c,jasonmsoft/rabbitmq-c,alanxz/rabbitmq-c,sakishum/rabbitmq-c,hjzljp/rabbitmq-c,chenwenbin928/rabbitmq-c,Haster2004/rabbitmq-c,Haster2004/rabbitmq-c,chenwenbin928/rabbitmq-c,jasonmsoft/rabbitmq-c,jasonmsoft/rabbitmq-c,jqk6/rabbitmq-c,soindy/rabbitmq-c,tempbottle/rabbitmq-c,chenwenbin928/rabbitmq-c,hjzljp/rabbitmq-c,hjzljp/rabbitmq-c,tempbottle/rabbitmq-c,jasonmsoft/rabbitmq-c,soindy/rabbitmq-c,soindy/rabbitmq-c