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/compilers/yosys/plugins/ghdl.nix

@@ -0,0 +1,32 @@
+{ stdenv, lib, fetchFromGitHub, pkg-config
+, yosys, readline, zlib, ghdl
+}:
+
+stdenv.mkDerivation {
+  pname = "yosys-ghdl";
+  version = "2021.01.25";
+  plugin = "ghdl";
+
+  src = fetchFromGitHub {
+    owner  = "ghdl";
+    repo   = "ghdl-yosys-plugin";
+    rev    = "cba859cacf8c6631146dbdaa0f297c060b5a68cd";
+    sha256 = "01d9wb7sqkmkf2y9bnn3pmhy08khzs5m1d06whxsiwgwnjzfk9mx";
+  };
+
+  buildInputs = [ yosys readline zlib ghdl ];
+  nativeBuildInputs = [ pkg-config ];
+
+  doCheck = true;
+  installPhase = ''
+    mkdir -p $out/share/yosys/plugins
+    cp ghdl.so $out/share/yosys/plugins/ghdl.so
+  '';
+
+  meta = with lib; {
+    description = "GHDL plugin for Yosys";
+    license     = licenses.isc;
+    platforms   = platforms.all;
+    maintainers = with maintainers; [ thoughtpolice ];
+  };
+}