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/libraries/drogon/fix_find_package.patch

@@ -0,0 +1,13 @@
+diff --git a/test.sh b/test.sh
+index f017b9a..027031e 100755
+--- a/test.sh
++++ b/test.sh
+@@ -135,7 +135,7 @@ if [ $os = "windows" ]; then
+   conan install $src_dir -s compiler="Visual Studio" -s compiler.version=16 -sbuild_type=Debug -g cmake_paths
+   cmake_gen="$cmake_gen -DCMAKE_TOOLCHAIN_FILE=conan_paths.cmake -DCMAKE_INSTALL_PREFIX=$src_dir/install"
+ fi
+-cmake .. $cmake_gen
++cmake .. $cmake_gen -DDrogon_DIR=$out/lib/cmake/Drogon -DTrantor_DIR=$out/lib/cmake/Trantor
+ 
+ if [ $? -ne 0 ]; then
+     echo "Failed to run CMake for example project"