bind: split out dnsutils & host binaries (#18903)

These tools are commonly used but don't require the other bind binaries.
Bind's libs are used, so they've also been split into an extra output.

The old version of host isn't maintained anymore and was removed From Debian
back in 2009: https://packages.qa.debian.org/h/host.html

pkgs/servers/dns/bind/default.nix

···
     sha256 = "1vxs29w4hnl7jcd7sknga58xv1qk2rcpsxyich7cpp7xi77faxd0";
   };
 
-  outputs = [ "bin" "dev" "out" "man" ];
+  outputs = [ "bin" "lib" "dev" "out" "man" "dnsutils" "host" ];
 
   patches = [ ./dont-keep-configure-flags.patch ./remove-mkdir-var.patch ] ++
     stdenv.lib.optional stdenv.isDarwin ./darwin-openssl-linking-fix.patch;
···
   postInstall = ''
     moveToOutput bin/bind9-config $dev
     moveToOutput bin/isc-config.sh $dev
+
+    moveToOutput bin/host $host
+    ln -sf $host/bin/host $bin/bin
+
+    moveToOutput bin/dig $dnsutils
+    moveToOutput bin/nslookup $dnsutils
+    moveToOutput bin/nsupdate $dnsutils
+    ln -sf $dnsutils/bin/{dig,nslookup,nsupdate} $bin/bin
+    ln -sf $host/bin/host $dnsutils/bin
 
     for f in "$out/lib/"*.la; do
       sed -i $f -e 's|-L${openssl.dev}|-L${openssl.out}|g'

pkgs/tools/networking/host/default.nix

···
-{ fetchurl, stdenv }:
-
-let version = "20000331"; in
-
-stdenv.mkDerivation {
-  name = "host-${version}";
-
-  src = fetchurl {
-    url = "mirror://debian/pool/main/h/host/host_${version}.orig.tar.gz";
-    sha256 = "1g352k80arhwyidsa95nk28xjvzyypmwv3kga2451m3g7fmdqki1";
-  };
-
-  preConfigure = ''
-    makeFlagsArray=(DESTBIN=$out/bin DESTMAN=$out/share/man OWNER=$(id -u) GROUP=$(id -g))
-    mkdir -p "$out/bin"
-    mkdir -p "$out/share/man/man1"
-  '';
-
-  installTargets = "install man";
-
-  meta = {
-    description = "DNS resolution utility";
-    license = "BSD-style";
-    platforms = stdenv.lib.platforms.linux;
-  };
-}

pkgs/top-level/all-packages.nix

···
 
   horst = callPackage ../tools/networking/horst { };
 
-  host = callPackage ../tools/networking/host { };
+  host = bind.host;
 
   hping = callPackage ../tools/networking/hping { };
 
···
   sabnzbd = callPackage ../servers/sabnzbd { };
 
   bind = callPackage ../servers/dns/bind { };
+  dnsutils = bind.dnsutils;
 
   bird = callPackage ../servers/bird { };
   bird6 = bird.override { enableIPv6 = true; };