Add missing fpu mode to mipsel r1 toolchain

gypfiles/toolchain.gypi

 # Copyright 2013 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 649 matching lines @@
                         'cflags': ['-mfp32'],
                       }],
                       [ 'clang==0', {
                         'cflags': ['-Wa,-mips32r2'],
                       }],
                     ],
                     'cflags': ['-mips32r2'],
                     'ldflags': ['-mips32r2'],
                   }],
                   ['mips_arch_variant=="r1"', {
+                    'defines': [
+                      'FPU_MODE_FP32',
+                    ],
                     'cflags!': ['-mfp64', '-mfpxx'],
                     'conditions': [
                       [ 'clang==0', {
                         'cflags': ['-Wa,-mips32'],
                       }],
                     ],
                     'cflags': ['-mips32'],
                     'ldflags': ['-mips32'],
                   }],
                   ['mips_arch_variant=="rx"', {
@@ skipping 702 matching lines @@
             ],
           },
           'Release_x64': {
             'inherit_from': ['ReleaseBase'],
           },
         }],
       ],
     },  # configurations
   },  # target_defaults
 }