fix: nil: Install named-compilezone

named-compilezone is an alias for named-checkzone: the two tools are
built from the same set of source files, but they behave differently
depending on which executable gets invoked.  With Automake,
named-compilezone was installed as a hard link to named-checkzone using
a custom installation hook; try to keep things simple with Meson by
using the install_symlink() method, which makes named-compilezone a
symbolic link to named-checkzone and is the same thing that is already
used for ddns-confgen/tsig-keygen.

See #5379

Merge branch '5379-install-named-compilezone' into 'main'

See merge request isc-projects/bind9!10595