rawsockets: Fix getaddrinfo on FreeBSD
rawsockets: Fix getaddrinfo on FreeBSD

Currently due bug in FreeBSD passing AI_V4MAPPED to addrinfo.ai_flags causes
getaddrinfo to fail with EAI_BADFLAGS ("Invalid value for ai_flags"). That's
why we should disable this flag for now on FreeBSD.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198092

sarvex/Nim-lang,Matt14916/Nim,msmith491/Nim,mbaulch/Nim,zachaysan/Nim,Dhertz/Nim,zachaysan/Nim,tulayang/Nim,dom96/Nim,endragor/Nim,Matt14916/Nim,sarvex/Nim-lang,Matt14916/Nim,russpowers/Nim,tulayang/Nim,haiodo/Nim,endragor/Nim,nanoant/Nim,jsanjuas/Nim,Dhertz/Nim,sarvex/Nim-lang,dom96/Nim,endragor/Nim,jfhg/Nim,jfhg/Nim,zachaysan/Nim,Dhertz/Nim,sarvex/Nim-lang,jsanjuas/Nim,singularperturbation/Nim,nanoant/Nim,Dhertz/Nim,sarvex/Nim-lang,haiodo/Nim,msmith491/Nim,russpowers/Nim,sarvex/Nim-lang,msmith491/Nim,endragor/Nim,russpowers/Nim,jfhg/Nim,jfhg/Nim,endragor/Nim,jsanjuas/Nim,zachaysan/Nim,singularperturbation/Nim,zachaysan/Nim,haiodo/Nim,jfhg/Nim,Matt14916/Nim,Matt14916/Nim,nanoant/Nim,mbaulch/Nim,jsanjuas/Nim,endragor/Nim,zachaysan/Nim,msmith491/Nim,tulayang/Nim,singularperturbation/Nim,singularperturbation/Nim,msmith491/Nim,haiodo/Nim,zachaysan/Nim,jsanjuas/Nim,nanoant/Nim,singularperturbation/Nim,russpowers/Nim,haiodo/Nim,Dhertz/Nim,mbaulch/Nim,jfhg/Nim,tulayang/Nim,dom96/Nim,nanoant/Nim,nanoant/Nim,dom96/Nim,singularperturbation/Nim,msmith491/Nim,jsanjuas/Nim,tulayang/Nim,Dhertz/Nim,mbaulch/Nim,endragor/Nim,sarvex/Nim-lang,dom96/Nim,russpowers/Nim,msmith491/Nim,jfhg/Nim,tulayang/Nim,Matt14916/Nim,mbaulch/Nim,singularperturbation/Nim,dom96/Nim,dom96/Nim,jsanjuas/Nim,haiodo/Nim,Dhertz/Nim,Matt14916/Nim,mbaulch/Nim,haiodo/Nim,nanoant/Nim,russpowers/Nim,mbaulch/Nim,russpowers/Nim