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/compilers/ponyc/make-safe-for-sandbox.patch

@@ -0,0 +1,105 @@
+diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
+index dab2aaef..26b587b1 100644
+--- a/lib/CMakeLists.txt
++++ b/lib/CMakeLists.txt
+@@ -36,7 +36,7 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
+ endif()
+ 
+ ExternalProject_Add(gbenchmark
+-    URL ${PONYC_GBENCHMARK_URL}
++    SOURCE_DIR gbenchmark-prefix/src/benchmark
+     CMAKE_ARGS -DCMAKE_BUILD_TYPE=${PONYC_LIBS_BUILD_TYPE} -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX} -DBENCHMARK_ENABLE_GTEST_TESTS=OFF -DCMAKE_CXX_FLAGS=${PONY_PIC_FLAG} --no-warn-unused-cli
+ )
+ 
+@@ -46,7 +46,7 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
+ endif()
+ 
+ ExternalProject_Add(googletest
+-    URL ${PONYC_GOOGLETEST_URL}
++    URL @googletest@
+     CMAKE_ARGS -DCMAKE_BUILD_TYPE=${PONYC_LIBS_BUILD_TYPE} -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX} -DCMAKE_CXX_FLAGS=${PONY_PIC_FLAG} -Dgtest_force_shared_crt=ON --no-warn-unused-cli
+ )
+ 
+@@ -59,82 +59,6 @@ install(TARGETS blake2
+     COMPONENT library
+ )
+ 
+-find_package(Git)
+-
+-set(LLVM_DESIRED_HASH "75e33f71c2dae584b13a7d1186ae0a038ba98838")
+-set(PATCHES_DESIRED_HASH "a16f299fbfced16a2bbc628746db341f2a5af9ae8cc9c9ef4b1e9ca26de3c292")
+-
+-if(GIT_FOUND)
+-    if(EXISTS "${PROJECT_SOURCE_DIR}/../.git")
+-        # Update submodules as needed
+-        option(GIT_SUBMODULE "Check submodules during build" ON)
+-        if(GIT_SUBMODULE)
+-            message(STATUS "Updating submodules...")
+-            execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive --depth 1
+-                            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+-                            RESULT_VARIABLE git_submod_result)
+-            #message("git_submod_result ${git_submod_result}")
+-            if(NOT git_submod_result EQUAL "0")
+-                message(FATAL_ERROR "git submodule update --init --recursive --depth 1 failed with ${git_submod_result}, please checkout submodules")
+-            endif()
+-
+-            # we check to make sure the submodule hash matches
+-            # the reason the submodule hash is in this file is to be able to use this file as a key for caching the libs in CI
+-            execute_process(COMMAND ${GIT_EXECUTABLE} submodule status
+-                            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+-                            OUTPUT_VARIABLE git_submod_output)
+-            #message("git_submod_output ${git_submod_output}")
+-            string(FIND "${git_submod_output}" "${LLVM_DESIRED_HASH}" LLVM_SUBMOD_POS)
+-            if(LLVM_SUBMOD_POS EQUAL "-1")
+-                message(FATAL_ERROR "Expecting the lib/llvm/src submodule to be at hash '${LLVM_DESIRED_HASH}'; found '${git_submod_output}'; update the LLVM_DESIRED_HASH variable in lib/CMakeLists.txt if you've updated the submodule.")
+-            endif()
+-        endif()
+-    endif()
+-
+-    # Apply patches
+-    message("Applying patches...")
+-    file(GLOB PONY_LLVM_PATCHES "${PROJECT_SOURCE_DIR}/llvm/patches/*.diff")
+-
+-    # check to see if the patch hashes match
+-    message("Checking patches ${PONY_LLVM_PATCHES}")
+-    set(PATCHES_ACTUAL_HASH "needed_if_no_patches")
+-    foreach (PATCH ${PONY_LLVM_PATCHES})
+-        file(STRINGS ${PATCH} patch_file NEWLINE_CONSUME)
+-        string(REPLACE "\n" " " patch_file ${patch_file})
+-        string(SHA256 patch_file_hash ${patch_file})
+-        # message("${PATCH}: '${patch_file_hash}'")
+-        string(CONCAT PATCHES_ACTUAL_HASH ${PATCHES_ACTUAL_HASH} ${patch_file_hash})
+-        # message("concat is '${PATCHES_ACTUAL_HASH}'")
+-    endforeach()
+-    string(SHA256 PATCHES_ACTUAL_HASH ${PATCHES_ACTUAL_HASH})
+-    # message("Desired hash ${PATCHES_DESIRED_HASH}")
+-    # message("Actual hash  ${PATCHES_ACTUAL_HASH}")
+-    if(NOT PATCHES_ACTUAL_HASH MATCHES "${PATCHES_DESIRED_HASH}")
+-        message(FATAL_ERROR "Patch hash actual '${PATCHES_ACTUAL_HASH}' does not match desired '${PATCHES_DESIRED_HASH}'")
+-    endif()
+-
+-    foreach (PATCH ${PONY_LLVM_PATCHES})
+-        message("  Checking ${PATCH}")
+-        execute_process(COMMAND ${GIT_EXECUTABLE} apply --check -p 1 --ignore-whitespace --whitespace=nowarn ${PATCH}
+-                        WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}/llvm/src"
+-                        ERROR_VARIABLE _err_out
+-                        RESULT_VARIABLE git_apply_check_result)
+-        if(git_apply_check_result EQUAL "0")
+-            message("    Applying ${PATCH}")
+-            execute_process(COMMAND ${GIT_EXECUTABLE} apply -p 1 --ignore-whitespace --whitespace=nowarn ${PATCH}
+-                            WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}/llvm/src"
+-                            RESULT_VARIABLE git_apply_result)
+-            if(NOT git_apply_result EQUAL "0")
+-                message(FATAL_ERROR "Unable to apply ${PATCH}")
+-            endif()
+-        else()
+-            message("    Already applied ${PATCH}")
+-        endif()
+-    endforeach()
+-else()
+-    message(FATAL_ERROR "Git not found!")
+-endif()
+-
+ message("Building targets: ${LLVM_TARGETS_TO_BUILD}")
+ 
+ set(LLVM_ENABLE_BINDINGS OFF)