[Apple Silicon] Don't set native llvm tools path when cross compiling swift

Author: shahmishal

cmake/modules/SwiftSharedCMakeConfig.cmake

@@ -58,7 +58,7 @@ macro(swift_common_standalone_build_config_llvm product)
     fix_imported_targets_for_xcode("${LLVM_EXPORTED_TARGETS}")
   endif()
 
-  if(NOT CMAKE_CROSSCOMPILING)
+  if(NOT CMAKE_CROSSCOMPILING AND NOT SWIFT_CROSS_COMPILING)
     set(${product}_NATIVE_LLVM_TOOLS_PATH "${LLVM_TOOLS_BINARY_DIR}")
   endif()