[musl] EDNS0 support?

["Bartłomiej Palmowski" <bart@trint.com>]

Hi,
we run alpine based docker images in AWS (inside our VPCs). Which
means that we're using dns servers provided by the AWS[1]. The problem
arises when we want to resolve a dns record that yields a large
response, for example:

$ nslookup eu.data.logs.insight.rapid7.com
Server:        10.11.12.13
Address:    10.11.12.13:53

Non-authoritative answer:
*** Can't find eu.data.logs.insight.rapid7.com: No answer

Non-authoritative answer:
*** Can't find eu.data.logs.insight.rapid7.com: No answer

According to what I managed to find out the reasons are as follows:
* edns0 is not advertise by the resolver
* there is no retry with TCP

Please advise on how we could reconfigure our images so that we're
able to resolve records with lots of RRs with a musl resolver.

1 - https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DNSBehavior.html

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