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

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

Index: tools/gn/secondary/third_party/nss/BUILD.gn
diff --git a/tools/gn/secondary/third_party/nss/BUILD.gn b/tools/gn/secondary/third_party/nss/BUILD.gn
index acb96a6d8b61b4908d588eb61fdf3b6bc58778bb..a0c167458558d8504ed2daa32b43e0cc943d87b1 100644
--- a/tools/gn/secondary/third_party/nss/BUILD.gn
+++ b/tools/gn/secondary/third_party/nss/BUILD.gn
@@ -1090,10 +1090,6 @@ if (is_linux) {
     }
 
     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=\"\"",
@@ -1104,6 +1100,7 @@ if (is_linux) {
       ]
 
       if (cpu_arch == "x86") {
+        sources -= [ "nss/lib/freebl/mpi/mpi_amd64.c" ]
         defines += [
           "NSS_X86_OR_X64",
           "NSS_X86",
@@ -1115,6 +1112,7 @@ if (is_linux) {
           "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",