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/cxxopts/fix-install-path.patch

@@ -0,0 +1,18 @@
+diff --git a/cmake/cxxopts.cmake b/cmake/cxxopts.cmake
+index 46e87ba..0ead543 100644
+--- a/cmake/cxxopts.cmake
++++ b/cmake/cxxopts.cmake
+@@ -87,7 +87,12 @@ endfunction()
+ 
+ # Helper function to ecapsulate install logic
+ function(cxxopts_install_logic)
+-    string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
++    if(CMAKE_LIBRARY_ARCHITECTURE)
++        string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
++    else()
++        # On some systems (e.g. NixOS), `CMAKE_LIBRARY_ARCHITECTURE` can be empty
++        set(CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
++    endif()
+     set(CXXOPTS_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR_ARCHIND}/cmake/cxxopts" CACHE STRING "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
+     set(version_config "${PROJECT_BINARY_DIR}/cxxopts-config-version.cmake")
+     set(project_config "${PROJECT_BINARY_DIR}/cxxopts-config.cmake")