dnscrypt-proxy2: Update to 2.0.27

* Version 2.0.27
 - The X25519 implementation was changed from using the Go standard
implementation to using Cloudflare's CIRCL library. Unfortunately,
CIRCL appears to be broken on big-endian systems. That change has been
reverted.
 - All the dependencies have been updated.

* Version 2.0.26
 - A new plugin was added to prevent Firefox from bypassing the system
DNS settings.
 - New configuration parameter to set how to respond to blocked
queries: `blocked_query_response`. Responses can now be empty record
sets, REFUSED response codes, or predefined IPv4 and/or IPv6 addresses.
 - The `refused_code_in_responses` and `blocked_query_response` options
have been folded into a new `blocked_query_response` option.
 - The fallback resolver is now accessed using TCP if `force_tcp` has
been set to `true`.
 - CPU usage when enabling DNSCrypt ephemeral keys has been reduced.
 - New command-line option: `-show-certs` to print DoH certificate
hashes.
 - Solaris packages are now provided.
 - DoH servers on a non-standard port, with stamps that don't include
IP addresses, and without working system resolvers can now be properly
bootstrapped.
 - A new option, `query_meta`, is now available to add optional records
to client queries.


(nia)