Bump the libuv requirement to libuv >= 1.34.0
By bumping the minimum libuv version to 1.34.0, it allows us to remove all libuv shims we ever had and makes the code much cleaner. The up-to-date libuv is available in all distributions supported by BIND 9.19+ either natively or as a backport.
Closes #3567 (closed)
Edited by Ondřej Surý