Porting changes from stdenv-updates into this branch.

This comes from:
svn diff  ^/nixpkgs/trunk/@18255 ^/nixpkgs/branches/stdenv-updates/ > diff
patch -p0 < diff
and then adding into svn all files new from the patch.

trunk@18255 comes from the last time I updated stdenv-updates from trunk.


svn path=/nixpkgs/stdenv-updates2/; revision=18272

pkgs/development/libraries/libxcrypt/default.nix

@@ -1,4 +1,7 @@
 {stdenv, fetchurl}:
+
+# I could not build it in armv5tel-linux
+assert stdenv.system != "armv5tel-linux";
    
 stdenv.mkDerivation {
   name = "libxcrypt-3.0.2";