Get rid of assumptions about ".nexe" extension.

tests/nanosleep/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')
 
 test_is_broken_on_this_os=False
 slop_args = []
 
 if 'TRUSTED_ENV' in env and (env['TRUSTED_ENV'].Bit('windows') or
                              env['TRUSTED_ENV'].Bit('mac')):
   slop_args += ['-s', '10']
   # Number of milliseconds by which a thread is allowed to wake up
   # early, after invoking nanosleep (on Windows, implemnted via
   # Sleep()).  On WinXP, Sleep sometimes return early.
 
 if 'TRUSTED_ENV' in env and env['TRUSTED_ENV'].Bit('windows'):
   test_is_broken_on_this_os=True
 
-env.ComponentProgram('nanosleep_test.nexe',
-                     'nanosleep_test.c',
-                     EXTRA_LIBS=['pthread'])
+nexe = env.ComponentProgram('nanosleep_test',
+                            'nanosleep_test.c',
+                            EXTRA_LIBS=['pthread'])
 
 # This is a timing test, so we only run on real hardware
 is_on_vm = env.Bit('running_on_vm')
 
 node = env.CommandSelLdrTestNacl(
     'nanosleep_test.out',
-    command=[env.File('nanosleep_test.nexe')] + slop_args)
+    nexe,
+    args=slop_args)
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_nanosleep_test',
     is_broken=is_on_vm or test_is_broken_on_this_os)