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/os-specific/linux/rtl8723bs/default.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchFromGitHub, nukeReferences, kernel }:
+with lib;
+stdenv.mkDerivation rec {
+  name = "rtl8723bs-${kernel.version}-${version}";
+  version = "2017-04-06";
+
+  src = fetchFromGitHub {
+    owner = "hadess";
+    repo = "rtl8723bs";
+    rev = "db2c4f61d48fe3b47c167c8bcd722ce83c24aca5";
+    sha256 = "0pxqya14a61vv2v5ky1ldybc0mjfin9mpvmajlmv0lls904rph7g";
+  };
+
+  hardeningDisable = [ "pic" ];
+
+  buildInputs = [ nukeReferences ];
+
+  makeFlags = [
+    "ARCH=${stdenv.hostPlatform.linuxArch}" # Normally not needed, but the Makefile sets ARCH in a broken way.
+    "KSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build" # Makefile uses $(uname -r); breaks us.
+  ];
+
+  enableParallelBuilding = true;
+
+  # The Makefile doesn't use env-vars well, so install manually:
+  installPhase = ''
+    mkdir -p      $out/lib/modules/${kernel.modDirVersion}/kernel/drivers/net/wireless
+    cp r8723bs.ko $out/lib/modules/${kernel.modDirVersion}/kernel/drivers/net/wireless
+
+    nuke-refs $(find $out -name "*.ko")
+  '';
+
+  meta = {
+    description = "Realtek SDIO Wi-Fi driver";
+    homepage = "https://github.com/hadess/rtl8723bs";
+    license = lib.licenses.gpl2;
+    platforms = lib.platforms.linux;
+    broken = versionAtLeast kernel.version "4.12"; # Now in kernel staging drivers
+    maintainers = with maintainers; [ elitak ];
+  };
+}