[CP] Fix for xfgcheck and Fix WAI ARM64 build (#19634) (#19644)

### Description
Fix WAI build by only conditionally copying linker flags



### Motivation and Context
I broke the WAI build that contains ORT on ARM64

cmake/winml.cmake

@@ -827,7 +827,6 @@ if (winml_is_inbox)
     get_target_property(compile_options ${target} COMPILE_OPTIONS)
     get_target_property(include_directories ${target} INCLUDE_DIRECTORIES)
     get_target_property(link_libraries ${target} LINK_LIBRARIES)
-    get_target_property(link_flags ${target} LINK_FLAGS)
     get_target_property(link_options ${target} LINK_OPTIONS)
 
     add_library(${new_target} SHARED ${sources})
@@ -836,8 +835,14 @@ if (winml_is_inbox)
     target_compile_options(${new_target} PRIVATE ${compile_options})
     target_include_directories(${new_target} PRIVATE ${include_directories})
     target_link_libraries(${new_target} PRIVATE ${link_libraries})
-    set_property(TARGET ${new_target} PROPERTY LINK_FLAGS "${link_flags}")
     target_link_options(${new_target} PRIVATE ${link_options})
+
+    # Attempt to copy linker flags 
+    get_target_property(link_flags ${target} LINK_FLAGS)
+
+    if (NOT link_flags MATCHES ".*NOTFOUND")
+      set_property(TARGET ${new_target} PROPERTY LINK_FLAGS "${link_flags}")
+    endif()
   endfunction()
 
   if (WAI_ARCH STREQUAL x64 OR WAI_ARCH STREQUAL arm64)