dns/dnscrypt-proxy2: Update to 2.0.10

Main changes in the port:

• Improve instructions for using dnscrypt-proxy2 together with unbound. [1]
• Add dnscrypt_proxy_suexec option for users who want to run the daemon as root.
• Move the configuration file from ${PREFIX}/etc/dnscrypt-proxy.toml to ${PREFIX}/etc/dnscrypt-proxy/dnscrypt-proxy.toml, because by default temporary files will use the path of the config file. This fixes a permission issue when fetching the public resolvers list.

Changes: https://raw.githubusercontent.com/jedisct1/dnscrypt-proxy/2.0.10/ChangeLog

PR: 227129 [1]
Submitted by: egypcio@googlemail.com (maintainer)
Reported by: erik@nordstroem.no [1]
Differential Revision: https://reviews.freebsd.org/D15024