[gn build] (manually) port 87dd519

Author: nico

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

@@ -22,12 +22,8 @@ if (current_toolchain == default_toolchain) {
       "_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY=",
       "_LIBCPP_HAS_NO_INCOMPLETE_FORMAT=",
       "_LIBCPP_HAS_NO_INCOMPLETE_RANGES=",
-      "_LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE=",
-      "_LIBCPP_HAS_NO_STDIN=",
-      "_LIBCPP_HAS_NO_STDOUT=",
       "_LIBCPP_HAS_NO_THREADS=",
       "_LIBCPP_HAS_NO_MONOTONIC_CLOCK=",
-      "_LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS=",
       "_LIBCPP_HAS_MUSL_LIBC=",
       "_LIBCPP_HAS_THREAD_API_PTHREAD=",
       "_LIBCPP_HAS_THREAD_API_EXTERNAL=",