Fixing up the arm subsystem versions (#8676)

* Adding arm64 and updating default subsystems

CMakeLists.txt

@@ -315,10 +315,13 @@ if (WIN32)
   #
   # Disable the following line for UNIX altjit on Windows
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /MANIFEST:NO") #Do not create Side-by-Side Assembly Manifest
-  if (CLR_CMAKE_HOST_ARCH STREQUAL arm)
-    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SUBSYSTEM:WINDOWS,6.02") #windows subsystem - arm minimum is 6.02
+
+  if (CLR_CMAKE_PLATFORM_ARCH_ARM)
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SUBSYSTEM:WINDOWS,6.02") #windows subsystem - arm minimum is 6.02  
+  elseif(CLR_CMAKE_PLATFORM_ARCH_ARM64)
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SUBSYSTEM:WINDOWS,6.03") #windows subsystem - arm64 minimum is 6.03  
   else ()
-    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SUBSYSTEM:WINDOWS,6.00") #windows subsystem
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SUBSYSTEM:WINDOWS,6.01") #windows subsystem
   endif ()
 
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /LARGEADDRESSAWARE") # can handle addresses larger than 2 gigabytes