Change startup ABI for untrusted code to be C-compatible

src/untrusted/nacl/nacl.scons

 # -*- python -*-
 # Copyright 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')
 
 # we have some empty source files
 env.FilterOut(CCFLAGS=['-pedantic'])
@@ skipping 18 matching lines @@
     'munmap.c',
     'nanosleep.c',
     'nacl_read_tp.c',
     'open.c',
     'read.c',
     'pthread_initialize_minimal.c',
     'pthread_stubs.c',
     'sbrk.c',
     'sched_yield.c',
     'stacktrace.c',
+    'start.c',
     'stat.c',
     'sysconf.c',
     'tls.c',
     'write.c',
     ]
 
 
 sources_for_nacl_extensions = [
     'gc_hooks.c',
     'nacl_irt.c',
@@ skipping 22 matching lines @@
                          'irt_mutex.c',
                          'irt_cond.c',
                          'irt_sem.c',
                          'irt_tls.c',
                          'irt_blockhook.c',
                          ]
 
 env.NaClSdkLibrary('libnacl', sources + irt_interface_sources)
 
 env.AddLibraryToSdk(['libnacl'])
-header_install = env.AddHeaderToSdk(['nacl_thread.h'])
+header_install = env.AddHeaderToSdk(['nacl_startup.h', 'nacl_thread.h'])
 env.Requires('libnacl', header_install)
 
 env.NaClSdkLibrary('libnacl_dyncode', ['dyncode.c'], LIBS=['nacl'])
 env.AddLibraryToSdk(['libnacl_dyncode'])
 
 imc_syscalls = [
     'imc_accept.c',
     'imc_connect.c',
     'imc_makeboundsock.c',
     'imc_mem_obj_create.c',
     'imc_recvmsg.c',
     'imc_sendmsg.c',
     'imc_socketpair.c',
     'nameservice.c',
     ]
 
 env.NaClSdkLibrary('libimc_syscalls', imc_syscalls)
 env.AddLibraryToSdk(['libimc_syscalls'])