minor update

Author: zhaomaosu

source/loader/CMakeLists.txt

@@ -169,7 +169,7 @@ if(UR_ENABLE_SANITIZER)
         target_link_libraries(ur_loader PRIVATE LLVMSupport LLVMSymbolize)
         # In in-tree build, if LLVM is built with libc++, we also need to build
         # symbolizer.cpp with libc++ abi and link libc++ in.
-        if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR AND LLVM_LIBCXX_USED)
+        if(NOT UR_STANDALONE_BUILD AND LLVM_LIBCXX_USED)
             execute_process(
                 COMMAND ${CMAKE_CXX_COMPILER} --print-file-name=libc++.a
                 OUTPUT_VARIABLE LIBCXX_PATH