Correct #ifdef DISABLE_SIGPIPE_WITH_SETSOCKOPT
Correct #ifdef DISABLE_SIGPIPE_WITH_SETSOCKOPT

An #ifdef got turned into an #if when the IPv6 changes
were being made, this corrects that.

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