Make the DNS over HTTPS support optional
This commit adds two new autoconf options --enable-doh
(enabled by
default) and --with-libnghttp2
(mandatory when DoH is enabled).
When DoH support is disabled the library is not linked-in and support for http(s) protocol is disabled in the netmgr, named and dig.
Closes #2478 (closed)
Edited by Ondřej Surý