Get rid of assumptions about ".nexe" extension.

tests/ppapi_example_audio/nacl.scons

 # -*- python -*-
 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This is a pepper audio example from examples/audio.
 
 Import('env')
 
 env.Prepend(CPPDEFINES=['XP_UNIX'])
 
-nexe_name = 'ppapi_example_audio_%s.nexe' % env.get('TARGET_FULLARCH')
+nexe_name = 'ppapi_example_audio_%s' % env.get('TARGET_FULLARCH')
 nexe = env.ComponentProgram(nexe_name,
                             [ 'audio.cc' ],
                             EXTRA_LIBS=['${PPAPI_LIBS}',
                                         'ppapi_cpp',
                                         'platform',
                                         'gio',
                                         'pthread',
                                         'm'])
 
 # Note that the html is required to run this program.
 env.Publish(nexe_name, 'run',
             ['ppapi_example_audio.html' , 'ppapi_example_audio.nmf'])
 
 test = env.PPAPIBrowserTester('ppapi_example_audio_test.out',
                               url='ppapi_example_audio.html#mute',
                               files=[nexe,
                                      env.File('ppapi_example_audio.nmf'),
                                      env.File('ppapi_example_audio.html')],
                               args=['--enable_experimental_js'])
 
 # Though this tests passes locally, it does not pass on the Windows
 # and Linux buildbots, which do not have audio devices.  Although
 # StartPlayback() and StopPlayback() succeed, the audio callback is
 # not called.  However, this does work on the Mac buildbots.
 is_broken = env.PPAPIBrowserTesterIsBroken() or not env.Bit('host_mac')
 env.AddNodeToTestSuite(test,
                        ['chrome_browser_tests'],
                        'run_ppapi_example_audio_test',
                        is_broken=is_broken)