build(macos): configure C++ standard and ICU root (#5101)

tools/CMakeLists.txt

@@ -2,6 +2,13 @@ cmake_minimum_required(VERSION 3.20)
 
 project(sunshine_tools)
 
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+if(NOT DEFINED CMAKE_CUDA_STANDARD)
+    set(CMAKE_CUDA_STANDARD 17)
+    set(CMAKE_CUDA_STANDARD_REQUIRED ON)
+endif()
+
 include_directories(
         "${CMAKE_SOURCE_DIR}"
         "${FFMPEG_INCLUDE_DIRS}"  # this is included only for logging
@@ -13,7 +20,6 @@ set(TOOL_SOURCES
 )
 
 add_executable(dxgi-info dxgi.cpp ${TOOL_SOURCES})
-set_target_properties(dxgi-info PROPERTIES CXX_STANDARD 23)
 target_link_libraries(dxgi-info
         ${Boost_LIBRARIES}
         ${CMAKE_THREAD_LIBS_INIT}
@@ -25,7 +31,6 @@ target_link_libraries(dxgi-info
 target_compile_options(dxgi-info PRIVATE ${SUNSHINE_COMPILE_OPTIONS})
 
 add_executable(audio-info audio.cpp ${TOOL_SOURCES})
-set_target_properties(audio-info PROPERTIES CXX_STANDARD 23)
 target_link_libraries(audio-info
         ${Boost_LIBRARIES}
         ${CMAKE_THREAD_LIBS_INIT}
@@ -37,7 +42,6 @@ target_link_libraries(audio-info
 target_compile_options(audio-info PRIVATE ${SUNSHINE_COMPILE_OPTIONS})
 
 add_executable(sunshinesvc sunshinesvc.cpp)
-set_target_properties(sunshinesvc PROPERTIES CXX_STANDARD 23)
 target_link_libraries(sunshinesvc
         ${CMAKE_THREAD_LIBS_INIT}
         wtsapi32