Add test running support for tests generated as pexes.

tests/toolchain/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')
 
 # force inclusion of entire library, so that we can validate it
 # NOTE: This approach does not work for -lc because of tons of
 #       undefined symbols which would have to be stubbed out
@@ skipping 12 matching lines @@
 # All the libraries were already included via -l switches in LINKFLAGS.
 # But we use them again in LIBS so scons knows about the dependencies.
 # _LIBFLAGS is the internal variable that puts the expansion of LIBS
 # into the command line; so by clearing that, we prevent scons from
 # adding repeated -l switches at the end of the link.
 nexe = env.ComponentProgram('dummy', 'dummy.c',
                             EXTRA_LINKFLAGS=DEP_LINKFLAGS,
                             LIBS=DEP_LIBS,
                             _LIBFLAGS='')
 node = env.CommandValidatorTestNacl('whole_archive_test.out',
-                                    image=[nexe])
+                                    image=nexe)
 env.AddNodeToTestSuite(node,
                        ['toolchain_tests', 'small_tests'],
                        'run_whole_archive_test')
 
 
 TESTS_TO_RUN = [
      # (src, exit_status, golden_file, cond),
      # The valus None for golden_file means no golden file, c.f.
      #  SConstruct::CommandTest()
      ('setlongjmp.c', '55', None, True),
@@ skipping 162 matching lines @@
                        ['toolchain_tests', 'small_tests'],
                        'run_strtoull_test')
 
 wcstoll_nexe = env.ComponentProgram('wcstoll', 'wcstoll.c',
                                     EXTRA_LIBS=['${NONIRT_LIBS}'])
 node = env.CommandSelLdrTestNacl('wcstoll.out', wcstoll_nexe)
 env.AddNodeToTestSuite(node,
                        ['toolchain_tests', 'small_tests'],
                        'run_wcstoll_test',
                        is_broken=env.Bit('nacl_glibc'))