Refactor how we load librpz.so
Currently, there are three ways how librpz.so could be linked into BIND 9. In BIND 9.17, the dlopen() is mandatory (via libltdl), so this needs little bit of refactoring.
Currently, there are three ways how librpz.so could be linked into BIND 9. In BIND 9.17, the dlopen() is mandatory (via libltdl), so this needs little bit of refactoring.