Revert r25914 because of clang build error.

tools/gyp/configurations_make.gypi

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'arm_cross_libc%': '/opt/codesourcery/arm-2009q1/arm-none-linux-gnueabi/libc',
     'dart_debug_optimization_level%': '2',
   },
   'target_defaults': {
@@ skipping 12 matching lines @@
           # TODO(iposva): Figure out if we need to pass anything else.
           #'-ansi',
           '-fno-rtti',
           '-fno-exceptions',
           '-fvisibility=hidden',
           '-fvisibility-inlines-hidden',
         ],
       },
 
       'Dart_ia32_Base': {
-        'cflags': [ '-m32', '-msse2', '-mfpmath=sse'],
+        'cflags': [ '-m32', '-msse2' ],
         'ldflags': [ '-m32', ],
       },
 
       'Dart_x64_Base': {
         'cflags': [ '-m64', '-msse2' ],
         'ldflags': [ '-m64', ],
       },
 
       'Dart_simarm_Base': {
         'cflags': [ '-O3', '-m32', '-msse2' ],
@@ skipping 44 matching lines @@
           '-fno-omit-frame-pointer',
         ],
       },
 
       'Dart_Release': {
         'cflags': [ '-O3', ],
       },
     },
   },
 }