samba4: Remove explicit libiconv specification

Changed files
-1
pkgs
top-level
-1
pkgs/top-level/all-packages.nix
···
samba4 = callPackage ../servers/samba/4.x.nix {
libgcrypt = libgcrypt_1_6;
-
libiconv = if stdenv.isLinux then null else libiconv;
python = python2;
pythonPackages = python2Packages;
};