win-signed-gplpv-drivers: deprecate phases

pkgs/applications/virtualization/driver/win-signed-gplpv-drivers/default.nix

···
   name = "gplpv-0.11.0.373";
   version = "0.11.0.373";
 
-  phases = [ "buildPhase" "installPhase" ];
+  dontUnpack = true;
 
   buildPhase = ''
     mkdir -p x86