[gn build] Port a595b931f1f9

diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index d189233..6210903 100644 (file)
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -686,6 +686,7 @@ if (current_toolchain == default_toolchain) {
       "__ranges/views.h",
       "__ranges/zip_view.h",
       "__split_buffer",
+      "__std_mbstate_t.h",
       "__string/char_traits.h",
       "__string/constexpr_c_functions.h",
       "__string/extern_template_lists.h",