pipewire: disable ldac when unavailable

ldacbt only supports little endian platforms.

This was mistakenly made unconditional when the ldacbtSupport option
was removed.  (It used to check availability in its default value.)

Fixes: 3cf2860 ("pipewire: remove superfluous args")

Author: alyssais

pkgs/development/libraries/pipewire/default.nix

@@ -160,7 +160,7 @@ stdenv.mkDerivation(finalAttrs: {
     # source code is not easily obtainable
     (lib.mesonEnable "bluez5-codec-lc3plus" false)
     (lib.mesonEnable "bluez5-codec-lc3" true)
-    (lib.mesonEnable "bluez5-codec-ldac" true)
+    (lib.mesonEnable "bluez5-codec-ldac" (lib.meta.availableOn stdenv.hostPlatform ldacbt))
     (lib.mesonEnable "opus" true)
     (lib.mesonOption "sysconfdir" "/etc")
     (lib.mesonEnable "raop" raopSupport)