Enabling c++ 20 in MacOS build (#16187)

### Description
<!-- Describe your changes. -->



### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

cmake/CMakeLists.txt

@@ -39,7 +39,12 @@ include(CMakeDependentOption)
 include(FetchContent)
 include(CheckFunctionExists)
 
+# TODO: update this once all system adapt c++20
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+set(CMAKE_CXX_STANDARD 20)
+else()
 set(CMAKE_CXX_STANDARD 17)
+endif()
 
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 # NOTE: POSITION INDEPENDENT CODE hurts performance, and it only make sense on POSIX systems

cmake/onnxruntime_config.h.in

@@ -22,5 +22,5 @@
 #cmakedefine HAS_UNUSED_BUT_SET_VARIABLE
 #cmakedefine HAS_UNUSED_VARIABLE
 #cmakedefine HAS_USELESS_CAST
-#cmakedefine ORT_BUILD_INFO u8"@ORT_BUILD_INFO@"
-#cmakedefine ORT_VERSION u8"@ORT_VERSION@"
+#cmakedefine ORT_BUILD_INFO "@ORT_BUILD_INFO@"
+#cmakedefine ORT_VERSION "@ORT_VERSION@"