Merge pull request #41498 from compnerd/builtin-offset

build: adjust the flags addition for the standard library

Author: compnerd

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -215,9 +215,7 @@ function(_add_target_variant_c_compile_flags)
     list(APPEND result "-DLLVM_ON_WIN32")
     list(APPEND result "-D_CRT_SECURE_NO_WARNINGS")
     list(APPEND result "-D_CRT_NONSTDC_NO_WARNINGS")
-    if(NOT "${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC")
-      list(APPEND result "-D_CRT_USE_BUILTIN_OFFSETOF")
-    endif()
+    list(APPEND result "-D_CRT_USE_BUILTIN_OFFSETOF")
     # TODO(compnerd) permit building for different families
     list(APPEND result "-D_CRT_USE_WINAPI_FAMILY_DESKTOP_APP")
     if("${CFLAGS_ARCH}" MATCHES arm)