Change built_elsewhere flag to work with pexe mode

src/trusted/service_runtime/build.scons

 # -*- python -*-
 # Copyright (c) 2012 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 platform
 import os
 
 Import('env')
 
@@ skipping 336 matching lines @@
                                      'nacl_fault_inject',
                                      'platform',
                                      ])
   env.Requires(SEL_LDR_NODE, crt)
 
   env.SDKInstallBin('sel_ldr', SEL_LDR_NODE)
 
 env.EnsureRequiredBuildWarnings()
 
 # Bootstrap loader used on Linux.
-if env.Bit('linux') and not env.CrossToolsBuild():
+if (env.Bit('linux') and not env.CrossToolsBuild() and
+    not env.Bit('built_elsewhere')):
   bootstrap_env = env.Clone()
   bootstrap_env.Replace(CLANG_OPTS='')
   bootstrap_env.FilterOut(CCFLAGS=['-fstack-protector', '-fPIC', '-fPIE',
                                    '-pedantic', '$COVERAGE_CCFLAGS'],
                           CFLAGS=['-Wdeclaration-after-statement'])
   bootstrap_env.Append(CCFLAGS=['-fno-pic', '-fno-PIC', '-fno-pie', '-fno-pie',
                                 '-fno-stack-protector'])
   if env.Bit('clang'):
     bootstrap_env.Append(CCFLAGS=['-ffreestanding',
                                   '-U__STDC_HOSTED__',
@@ skipping 582 matching lines @@
   # TODO(tuduce): Make it work on windows.
   env.AddNodeToTestSuite(node, ['medium_tests'],
                          'run_sel_ldr_thread_death_test',
                          is_broken=env.Bit('windows'))
 
 
 # This currently tests linking of sel_main_chrome.c *only*.  We do not
 # expect this program to do anything meaningful when run.
 env.ComponentProgram('sel_main_chrome_test', ['sel_main_chrome_test.c'],
                      EXTRA_LIBS=sel_ldr_libs)