rdesktop: enable IPv6 support

+1
+1
pkgs/applications/networking/remote/rdesktop/default.nix
··· 13 buildInputs = [openssl libX11]; 14 15 configureFlags = [ 16 "--with-openssl=${openssl.dev}" 17 "--disable-credssp" 18 "--disable-smartcard"
··· 13 buildInputs = [openssl libX11]; 14 15 configureFlags = [ 16 + "--with-ipv6" 17 "--with-openssl=${openssl.dev}" 18 "--disable-credssp" 19 "--disable-smartcard"