uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/tools/build-managers/shards/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, fetchFromGitHub
+, crystal
+}:
+
+let
+  generic =
+    { version, hash }:
+
+    crystal.buildCrystalPackage {
+      pname = "shards";
+      inherit version;
+
+      src = fetchFromGitHub {
+        owner = "crystal-lang";
+        repo = "shards";
+        rev = "v${version}";
+        inherit hash;
+      };
+
+      # we cannot use `make` or `shards` here as it would introduce a cyclical dependency
+      format = "crystal";
+      shardsFile = ./shards.nix;
+      crystalBinaries.shards.src = "./src/shards.cr";
+
+      # tries to execute git which fails spectacularly
+      doCheck = false;
+
+      meta = with lib; {
+        description = "Dependency manager for the Crystal language";
+        license = licenses.asl20;
+        maintainers = with maintainers; [ peterhoeg ];
+        inherit (crystal.meta) homepage platforms;
+      };
+    };
+
+in
+rec {
+  shards_0_17 = generic {
+    version = "0.17.0";
+    hash = "sha256-f9MptrKalW7gi0J2h0fokkzdjKBVa2TmoPX8BYffqzY=";
+  };
+
+  shards = shards_0_17;
+}

pkgs/development/tools/build-managers/shards/shards.nix

@@ -0,0 +1,8 @@
+{
+  molinillo = {
+    owner = "crystal-lang";
+    repo = "crystal-molinillo";
+    rev = "v0.2.0";
+    sha256 = "0pzi8pbrjn03zgk3kbha2kqqq0crmr8gy98dr05kisafvbghzwnh";
+  };
+}