[gn build] Port 34e0f9cd36e9

llvm/utils/gn/secondary/libcxx/include/BUILD.gn

diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 5e52a2a..0a18e67 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -575,7 +575,6 @@
       "__locale_dir/locale_base_api/ibm.h",
       "__locale_dir/locale_base_api/musl.h",
       "__locale_dir/locale_base_api/openbsd.h",
-      "__locale_dir/locale_guard.h",
       "__locale_dir/pad_and_output.h",
       "__locale_dir/support/apple.h",
       "__locale_dir/support/bsd_like.h",