Turn more licenses into lib.licenses style

Should eval cleanly, as far as -A tarball tells me.

Relevant: issue #2999, issue #739

pkgs/development/libraries/scmccid/default.nix

@@ -4,7 +4,7 @@ assert stdenv ? gcc && stdenv.gcc.libc != null;
 
 stdenv.mkDerivation rec {
   name = "scmccid-5.0.11";
-  
+
   src = if stdenv.system == "i686-linux" then (fetchurl {
       url = "http://www.scmmicro.com/support/download/scmccid_5.0.11_linux.tar.gz";
       sha256 = "1r5wkarhzl09ncgj55baizf573czw0nplh1pgddzx9xck66kh5bm";
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://www.scmmicro.com/support/pc-security-support/downloads.html;
     description = "PCSC drivers for linux, for the SCM SCR3310 v2.0 card and others";
-    license = "nonfree";
+    license = stdenv.lib.licenses.unfree;
     maintainers = with stdenv.lib.maintainers; [viric];
     platforms = with stdenv.lib.platforms; linux;
   };