net: stop using go:linkname

[mmatczuk]

Go 1.23 prevents us from accessing unexpected parts of standard library.

At the moment we use

1. config.go://go:linkname isDomainName net.isDomainName
2. utils/osdns/resolvconf.go://go:linkname resolvConf net.resolvConf
3. utils/osdns/resolvconf.go://go:linkname getSystemDNSConfig net.getSystemDNSConfig
4. resolver.go://go:linkname lookupStaticHost net.lookupStaticHost

We need to figure out what to do case by case.

[mmatczuk]

Caused by #894

[mmatczuk]

//go:linkname isDomainName net.isDomainName is OK