This patch adds a <bits/types/res_state.h> header, to simplify

backporting.

diff --git a/include/bits/types/res_state.h b/include/bits/types/res_state.h

new file mode 100644

index 0000000000000000..568c768f444d0198

--- /dev/null

+++ b/include/bits/types/res_state.h

@@ -0,0 +1,2 @@

+#define __need_res_state

+#include <resolv.h>