installer: enable vmware guest support on x86 only

The vmware guest module asserts on this exact condition, so let's only
enable it on that condition.

Changed files
+1 -1
nixos
modules
+1 -1
nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix
···
# VM guest additions to improve host-guest interaction
services.spice-vdagentd.enable = true;
services.qemuGuest.enable = true;
-
virtualisation.vmware.guest.enable = true;
+
virtualisation.vmware.guest.enable = pkgs.stdenv.hostPlatform.isx86;
virtualisation.hypervGuest.enable = true;
services.xe-guest-utilities.enable = true;
# The VirtualBox guest additions rely on an out-of-tree kernel module