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/tools/package-management/xbps/default.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchFromGitHub, pkg-config, which, zlib, openssl, libarchive }:
+
+stdenv.mkDerivation rec {
+  pname = "xbps";
+  version = "0.59.1";
+
+  src = fetchFromGitHub {
+    owner = "void-linux";
+    repo = "xbps";
+    rev = version;
+    sha256 = "0pab3xf97y4wqlyrb92zxd3cfsrbnlx6pssbw4brgwcxccw9jrhy";
+  };
+
+  nativeBuildInputs = [ pkg-config which ];
+
+  buildInputs = [ zlib openssl libarchive ];
+
+  patches = [ ./cert-paths.patch ];
+
+  NIX_CFLAGS_COMPILE = "-Wno-error=unused-result";
+
+  postPatch = ''
+    # fix unprefixed ranlib (needed on cross)
+    substituteInPlace lib/Makefile \
+      --replace 'SILENT}ranlib ' 'SILENT}$(RANLIB) '
+
+    # Don't try to install keys to /var/db/xbps, put in $out/share for now
+    substituteInPlace data/Makefile \
+      --replace '$(DESTDIR)/$(DBDIR)' '$(DESTDIR)/$(SHAREDIR)'
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    homepage = "https://github.com/void-linux/xbps";
+    description = "The X Binary Package System";
+    platforms = platforms.linux; # known to not work on Darwin, at least
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ dtzWill ];
+  };
+}