Get rid of assumptions about ".nexe" extension.

tests/earth/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.
 
 Import('env')
 
 if (not env.Bit('bitcode')):
   flags = ['-mfpmath=sse', '-msse2', '-O3', '-ffast-math',
            '-fomit-frame-pointer']
   env.Append(CCFLAGS=flags)
   env.Append(CXXFLAGS=flags)
 
 earthlib = env.ComponentLibrary('earthlib', ['earth.cc'])
 
 # build, C then C++
 cobj=['pepper_c.c']
-c_nexe_name = 'earth_c_%s.nexe' % env.get('TARGET_FULLARCH')
+c_nexe_name = 'earth_c_%s' % env.get('TARGET_FULLARCH')
 cnexe = env.ComponentProgram(c_nexe_name, cobj,
                             EXTRA_LIBS=['earthlib',
                                         '${PPAPI_LIBS}',
                                         'm', 'pthread'])
 env.Publish(c_nexe_name, 'run', ['earth_c.html', 'earth_c.nmf'])
 
 node = env.DemoSelLdrNacl('demo_earth_c', cnexe, args=[])
 # Note: Make this available from top level
 Alias('demo_earth_c', node)
 
 ccobj=['pepper_cc.cc']
-cc_nexe_name = 'earth_cc_%s.nexe' % env.get('TARGET_FULLARCH')
+cc_nexe_name = 'earth_cc_%s' % env.get('TARGET_FULLARCH')
 ccnexe = env.ComponentProgram(cc_nexe_name, ccobj,
                             EXTRA_LIBS=['earthlib',
                                         '${PPAPI_LIBS}',
                                         'ppapi_cpp',
                                         'm', 'pthread'])
 env.Publish(cc_nexe_name, 'run', ['earth_cc.html', 'earth_cc.nmf'])
 
 node = env.DemoSelLdrNacl('demo_earth_cc', ccnexe, args=[])
 # Note: Make this available from top level
 Alias('demo_earth_cc', node)
@@ skipping 37 matching lines @@
     'earth_browser_test_cc.out',
     url='earth_cc.html',
     files=[ccnexe,
            env.File('earth_cc.html'),
            env.File('earth_cc.nmf'),
            ],
     args=['--enable_experimental_js']
     )
 
 env.AddNodeToTestSuite(node, ['chrome_browser_tests'], 'earth_browser_test_cc')