fixes potential cache key oob write

this relies on a lot of things (intrinsic), frame pointer and symbol dynamic symbol table

also some cleanup and version bump to Q2

previously a CNAME RR could be merged as a queried type RR, leading to failed cache lookups as ‘expired’

previously if NS had no A/AAAA records, they we’re looked up in subrequests, after that a new NS was reelected (possibly preferring another unknown), now it stays true to the NS of choice and changes only if it is unuseable

the cache_peek() api was reworked to return an error code instead, from this the caller can tell whether the record is present (but expired) or missing. this save a secondary CNAME lookup in case the original record was just expired

this LRU-like cache tracks lame nameservers, unresolvable
nameservers (to not waste resources in trying to resolve them),
and possibly other features (extension support, …)

This reverts commit 91a2945e.

Conflicts:
	daemon/worker.h

this avoids repetitive allocation/free cycles on load