Destinations CMake: pass -Xfrontend -validate-tbd-against-ir=none

This fixes an issue with the Windows build highlighted in #6361 (comment)

Author: MaxDesiatov

Sources/CrossCompilationDestinationsTool/CMakeLists.txt

@@ -26,6 +26,10 @@ target_link_libraries(CrossCompilationDestinationsTool PUBLIC
 # NOTE(compnerd) workaround for CMake not setting up include flags yet
 set_target_properties(CrossCompilationDestinationsTool PROPERTIES
   INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
+  
+
+target_compile_options(CrossCompilationDestinationsTool PRIVATE
+  -Xfrontend -validate-tbd-against-ir=none)
 
 if(USE_CMAKE_INSTALL)
 install(TARGETS CrossCompilationDestinationsTool