[gn build] Port 3e4153c

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn

@@ -305,6 +305,7 @@ copy("Headers") {
     "riscv_bitmanip.h",
     "riscv_corev_alu.h",
     "riscv_crypto.h",
+    "riscv_nds.h",
     "riscv_ntlh.h",
     "rtmintrin.h",
     "s390intrin.h",