lib/systems/inspect: Fix after assertions

Function are never equal in Nix, so we need to filter out this attribute
in ABIs.

lib/systems/inspect.nix

@@ -3,6 +3,9 @@ with import ./parse.nix { inherit lib; };
 with lib.attrsets;
 with lib.lists;
 
+let abis_ = abis; in
+let abis = lib.mapAttrs (_: abi: builtins.removeAttrs abi [ "assertions" ]) abis_; in
+
 rec {
   patterns = rec {
     isi686         = { cpu = cpuTypes.i686; };