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/pandoc/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, lib, haskellPackages, fetchpatch, haskell, removeReferencesTo }:
+
+let
+  static = haskell.lib.compose.justStaticExecutables haskellPackages.pandoc;
+
+in
+  (haskell.lib.compose.overrideCabal (drv: {
+    configureFlags = drv.configureFlags or [] ++ ["-fembed_data_files"];
+    buildDepends = drv.buildDepends or [] ++ [haskellPackages.file-embed];
+    buildTools = (drv.buildTools or []) ++ [ removeReferencesTo ];
+
+    postInstall = drv.postInstall or "" + ''
+      remove-references-to \
+        -t ${haskellPackages.pandoc-types} \
+        $out/bin/pandoc
+    '' + lib.optionalString (stdenv.buildPlatform == stdenv.hostPlatform) ''
+      mkdir -p $out/share/bash-completion/completions
+      $out/bin/pandoc --bash-completion > $out/share/bash-completion/completions/pandoc
+    '';
+  }) static).overrideAttrs (drv: {
+    # These libraries are still referenced, because they generate
+    # a `Paths_*` module for figuring out their version.
+    # The `Paths_*` module is generated by Cabal, and contains the
+    # version, but also paths to e.g. the data directories, which
+    # lead to a transitive runtime dependency on the whole GHC distribution.
+    # This should ideally be fixed in haskellPackages (or even Cabal),
+    # but a minimal pandoc is important enough to patch it manually.
+    disallowedReferences = [ haskellPackages.pandoc-types ];
+  })