cmake: Remove the intermediate static libs

See merge request !7

Should compile faster (and also take less space on disk)

Fix a memory leak that would occur on every DNS request, when using udns

This reverts commit 38ff50f5.

Also makes the coverage code deterministic

Makes the codecoverage deterministic (it does not depend on the order of
v4/v6 resolution)

This adds a hard dependency on one of Botan or gcrypt. Botan is already a
recommended dependency, and gcrypt is probably packaged almost everywhere,
so this should not be a big deal.

ref #3241

And add a test for it.

fix #3238

This reverts commit 26eb28dc.

[ci skip]

fix #3235