blueman: fix cross-compilation

blueman checks runtime deps during the configure.

Fixes the following error when cross-compiling (in this case, to
aarch64):

```
error: builder for '/nix/store/kzrxxlk0vpsz6hwhl4rgf0ankfp3639h-blueman-aarch64-unknown-linux-gnu-2.3.5.drv' failed with exit code 1;
last 10 log lines:
> checking for python version... 3.10
> checking for python platform... linux
> checking for GNU default python prefix... ${prefix}
> checking for GNU default python exec_prefix... ${exec_prefix}
> checking for python script directory (pythondir)... ${PYTHON_PREFIX}/lib/python3.10/site-packages
> checking for python extension module directory (pyexecdir)... ${PYTHON_EXEC_PREFIX}/lib/python3.10/site-packages
> checking for python-3.10... yes
> checking for ifconfig... no
> checking for ip... no
> configure: error: ifconfig or ip not found, install net-tools or iproute2
For full logs, run 'nix log /nix/store/kzrxxlk0vpsz6hwhl4rgf0ankfp3639h-blueman-aarch64-unknown-linux-gnu-2.3.5.drv'.
error: building '/nix/store/kzrxxlk0vpsz6hwhl4rgf0ankfp3639h-blueman-aarch64-unknown-linux-gnu-2.3.5.drv' failed
```

Signed-off-by: Christoph Heiss <[e-mail]>

pkgs/tools/bluetooth/blueman/default.nix

···
   ];
 
   buildInputs = [ bluez gtk3 pythonPackages.python librsvg
-                  gnome.adwaita-icon-theme iproute2 networkmanager ]
+                  gnome.adwaita-icon-theme networkmanager ]
                 ++ pythonPath
                 ++ lib.optional withPulseAudio libpulseaudio;
 
···
   configureFlags = [
     "--with-systemdsystemunitdir=${placeholder "out"}/lib/systemd/system"
     "--with-systemduserunitdir=${placeholder "out"}/lib/systemd/user"
+    # Don't check for runtime dependency `ip` during the configure
+    "--disable-runtime-deps-check"
     (lib.enableFeature withPulseAudio "pulseaudio")
   ];