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/shells/fish/wrapper.nix

@@ -0,0 +1,25 @@
+{ lib, writeShellScriptBin, fish }:
+
+with lib;
+
+makeOverridable ({
+  completionDirs ? [],
+  functionDirs ? [],
+  confDirs ? [],
+  pluginPkgs ? []
+}:
+
+let
+  vendorDir = kind: plugin: "${plugin}/share/fish/vendor_${kind}.d";
+  complPath = completionDirs ++ map (vendorDir "completions") pluginPkgs;
+  funcPath = functionDirs ++ map (vendorDir "functions") pluginPkgs;
+  confPath = confDirs ++ map (vendorDir "conf") pluginPkgs;
+
+in writeShellScriptBin "fish" ''
+  ${fish}/bin/fish --init-command "
+    set --prepend fish_complete_path ${escapeShellArgs complPath}
+    set --prepend fish_function_path ${escapeShellArgs funcPath}
+    set --local fish_conf_source_path ${escapeShellArgs confPath}
+    for c in \$fish_conf_source_path/*; source \$c; end
+  " "$@"
+'')