pulseaudio: Drop Apple SDK dependency

The x86_64 and aarch64 SDK attributes are named differently and don't
have the same contents. This was the motivation to try dropping the SDK
dependency altogether, relying only on the Libc and some frameworks.

pkgs/servers/pulseaudio/default.nix

@@ -94,7 +94,6 @@ stdenv.mkDerivation rec {
     ]
     ++ lib.optional (jackaudioSupport && !libOnly) "--enable-jack"
     ++ lib.optionals stdenv.isDarwin [
-      "--with-mac-sysroot=${sdk}"
       "--disable-neon-opt"
     ]
     ++ lib.optional (stdenv.isLinux && useSystemd) "--with-systemduserunitdir=${placeholder "out"}/lib/systemd/user"