Fix cross-compilation for ARM (hopefully)

tools/gyp/v8.gyp

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 96 matching lines @@
                     'cflags': [
                       '-mfloat-abi=hard',
                     ],
                   }, {
                     'defines': [
                       'USE_EABI_HARDFLOAT=0',
                     ],
                   }],
                   # The ARM assembler assumes the host is 32 bits,
                   # so force building 32-bit host tools.
-                  [ 'host_arch=="x64"', {
+                  [ 'host_arch=="x64" and _toolset=="host"', {
                     'cflags': ['-m32'],
                     'ldflags': ['-m32'],
                   }],
                 ],
               }],
               ['v8_target_arch=="ia32"', {
                 'defines': [
                   'V8_TARGET_ARCH_IA32',
                 ],
               }],
@@ skipping 931 matching lines @@
             }],
           ],
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }