Get rid of assumptions about ".nexe" extension.

tests/browser_dynamic_library/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 'TRUSTED_ENV' not in env:
   Return()
 if env.Bit('nacl_static_link'):
@@ skipping 13 matching lines @@
     'libimc_syscalls.so',
     'libgio.so',
     'libnacl.so',
     )
 file_mapping = []
 for library_name in libraries:
   file_mapping.append(('lib/%s' % library_name,
                        env.File('${NACL_SDK_LIB}/' + library_name)))
 
 
-test_prog_fname = 'ppapi_test_example_%s.nexe' % env.get('TARGET_FULLARCH')
+test_prog_fname = 'ppapi_test_example_${TARGET_FULLARCH}${PROGSUFFIX}'
 test_prog = env.File('${STAGING_DIR}/' + test_prog_fname)
 file_mapping.append((test_prog_fname, test_prog))
 
 
 node = env.PPAPIBrowserTester(
     'browser_dynamic_library_test.out', url='dynamic_library_test.html',
     files=[env.File('dynamic_library_test.html'),
            env.File('dynamic_library_helper.js')],
     map_files=file_mapping,
     # TODO(mseaborn): We will get some 404 errors because the "tls"
     # subdir is in nacl-glibc's search path (we should remove it) and
     # because we're not using an explicit mapping based on a manifest
     # file yet.
     args=['--allow_404', '--enable_experimental_js'])
 
 env.AddNodeToTestSuite(node, ['dynamic_library_browser_tests'],
                        'run_browser_dynamic_library_test',
                        is_broken=env.PPAPIBrowserTesterIsBroken())