Add fnl build target

shell/BUILD.gn

 # Copyright 2014 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/ui.gni")
 import("//mojo/public/mojo.gni")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//mojo/tools/embed/rules.gni")
 import("//testing/test.gni")
@@ skipping 108 matching lines @@
       ]
       deps = [
         ":mojo_shell_child",
       ]
     }
   }
 
   group("mojo_shell_child_32_bit") {
     # This group is required to run any 32-bit child process.
     deps = []
-    if ((target_cpu == "x64" || target_cpu == "x86") && is_linux) {
+    if ((target_cpu == "x64" || target_cpu == "x86") && is_linux && !is_fnl) {
       # The toolchain is hardcoded as 32-bit clang here -- although it must
       # be 32 bit (for nonsfi), it assumes clang. Ideally, the toolchain would
       # be defined as the 32 bit variant of whatever is being used (be it clang,
       # gcc, or something else).
       deps = [
         ":mojo_shell_child_32_bit_copy(//build/toolchain/linux:clang_x86)",
       ]
     }
   }
 }  # !mojo_use_prebuilt_mojo_shell
@@ skipping 502 matching lines @@
       "${root_out_dir}/libmojo_shell.so",
     ]
   } else {
     sources += [ "${root_out_dir}/mojo_shell" ]
   }
 
   outputs = [
     "${root_out_dir}/symbols/{{source_file_part}}",
   ]
 }