virtualbox: add license

Changed files
+1
pkgs
applications
virtualization
virtualbox
+1
pkgs/applications/virtualization/virtualbox/default.nix
···
meta = {
description = "PC emulator";
homepage = http://www.virtualbox.org/;
maintainers = with maintainers; [ flokli sander ];
platforms = [ "x86_64-linux" "i686-linux" ];
···
meta = {
description = "PC emulator";
+
license = licenses.gpl2;
homepage = http://www.virtualbox.org/;
maintainers = with maintainers; [ flokli sander ];
platforms = [ "x86_64-linux" "i686-linux" ];