Add RLZ build file for GN build, fix Windows build.

tools/gn/secondary/third_party/nss/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/linux/pkg_config.gni")
 
 if (is_linux) {
   # This is a dependency on NSS with no libssl. On Linux we use a built-in SSL
   # library but the system NSS libraries. Non-Linux platforms using NSS use the
   # hermetic one in //third_party/nss.
@@ skipping 1072 matching lines @@
         "SOFTOKEN_LIB_NAME=\"libsoftokn3.dylib\"",
       ]
 
       configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
     } else {
       # Not Mac/iOS.
       sources -= [ "nss/lib/freebl/mpi/mpi_arm_mac.c" ]
     }
 
     if (is_win) {
-      sources -= [
-        "nss/lib/freebl/mpi/mpi_amd64.c",
-        "nss/lib/freebl/mpi/mpi_x86_asm.c",
-      ]
       defines += [
         "SHLIB_SUFFIX=\"dll\"",
         "SHLIB_PREFIX=\"\"",
         "SOFTOKEN_LIB_NAME=\"softokn3.dll\"",
         "XP_PC",
         "WIN32",
         "WIN95",
       ]
 
       if (cpu_arch == "x86") {
+        sources -= [ "nss/lib/freebl/mpi/mpi_amd64.c" ]
         defines += [
           "NSS_X86_OR_X64",
           "NSS_X86",
           "_X86_",
           "MP_ASSEMBLY_MULTIPLY",
           "MP_ASSEMBLY_SQUARE",
           "MP_ASSEMBLY_DIV_2DX1D",
           "MP_USE_UINT_DIGIT",
           "MP_NO_MP_WORD",
         ]
       } else if (cpu_arch == "x64") {
+        sources -= [ "nss/lib/freebl/mpi/mpi_x86_asm.c" ]
         defines += [
           "NSS_USE_64",
           "NSS_X86_OR_X64",
           "NSS_X64",
           "_AMD64_",
           "MP_CHAR_STORE_SLOW",
           "MP_IS_LITTLE_ENDIAN",
           "WIN64",
         ]
       }
@@ skipping 22 matching lines @@
 
     deps = [
       ":nspr",
       "//third_party/sqlite",
     ]
 
     forward_dependent_configs_from = [ ":nspr" ]
   }
 }  # Windows/Mac/iOS.