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/analysis/retdec/yaracpp.nix

@@ -0,0 +1,49 @@
+{ stdenv
+, fetchFromGitHub
+, coreutils
+}:
+
+let
+  yara = fetchFromGitHub {
+    owner = "avast-tl";
+    repo = "yara";
+    rev = "ea101c5856941f39cad2db3012f2660d1d5c8b65";
+    sha256 = "033ssx2hql5k4pv9si043s3mjq2b748ymjzif8pg6rdwh260faky";
+  };
+in stdenv.mkDerivation rec {
+  # only fetches the yaracpp source patched to work with a local yara clone,
+  # does not build anything
+  pname = "yaracpp-src";
+  version = "2018-10-09";
+  rev = "b92bde0e59e3b75bc445227e04b71105771dee8b"; # as specified in retdec/deps/yaracpp/CMakeLists.txt
+
+  src = fetchFromGitHub {
+    inherit rev;
+    owner = "avast-tl";
+    repo = "yaracpp";
+    sha256 = "0fan7q79j7s3bjmhsd2nw6sqyi14xgikn7mr2p4nj87lick5l4a2";
+  };
+
+  postPatch = ''
+      # check if our version of yara is the same version that upstream expects
+      echo "Checking version of yara"
+      expected_rev="$( sed -n -e 's|.*URL https://github.com/.*/archive/\(.*\)\.zip.*|\1|p' "deps/CMakeLists.txt" )"
+      if [ "$expected_rev" != '${yara.rev}' ]; then
+        echo "The yara dependency has the wrong version: ${yara.rev} while $expected_rev is expected."
+        exit 1
+      fi
+
+      # patch the CMakeLists.txt file to use our local copy of the dependency instead of fetching it at build time
+      sed -i -e "s|URL .*|URL ${yara}|" "deps/CMakeLists.txt"
+
+      # abuse the CONFIGURE_COMMAND to make the source writeable after copying it to the build locatoin (necessary for the build)
+      sed -i -e 's|CONFIGURE_COMMAND ""|CONFIGURE_COMMAND COMMAND ${coreutils}/bin/chmod -R u+w .|' "deps/CMakeLists.txt"
+    '';
+
+  buildPhase = "# do nothing";
+  configurePhase = "# do nothing";
+  installPhase = ''
+    mkdir -p "$out"
+    cp -r * "$out"
+  '';
+}