cramfsswap: 1.4.1 -> 1.4.2, cleanup

* fix cross-compilation
* clarify license

pkgs/os-specific/linux/cramfsswap/default.nix

@@ -2,13 +2,18 @@
 
 stdenv.mkDerivation rec {
   pname = "cramfsswap";
-  version = "1.4.1";
+  version = "1.4.2";
 
   src = fetchurl {
-    url = "mirror://debian/pool/main/c/cramfsswap/${pname}_${version}.tar.gz";
-    sha256 = "0c6lbx1inkbcvvhh3y6fvfaq3w7d1zv7psgpjs5f3zjk1jysi9qd";
+    url = "mirror://debian/pool/main/c/cramfsswap/${pname}_${version}.tar.xz";
+    sha256 = "10mj45zx71inaa3l1d81g64f7yn1xcprvq4v4yzpdwbxqmqaikw1";
   };
 
+  # Needed for cross-compilation
+  postPatch = ''
+    substituteInPlace Makefile --replace 'strip ' '$(STRIP) '
+  '';
+
   buildInputs = [zlib];
 
   installPhase = ''
@@ -18,7 +23,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Swap endianess of a cram filesystem (cramfs)";
     homepage = "https://packages.debian.org/sid/utils/cramfsswap";
-    license = licenses.gpl2;
+    license = licenses.gpl2Only;
     platforms = platforms.linux;
   };
 }