Switch from using 'nacl_main' to 'main' entry point

ports/nacl-spawn/cli_main.c

 /*
  * Copyright (c) 2014 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.
  */
 
 /* Define a typical entry point for command line tools spawned by bash
  * (e.g., ls, objdump, and objdump). */
 
 #define _GNU_SOURCE
 
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
+#include <stdbool.h>
 
 #include "nacl_io/nacl_io.h"
 #include "nacl_main.h"
 #include "ppapi_simple/ps.h"
 #include "ppapi_simple/ps_main.h"
 
+bool _cli_main_init = false;
+
 #ifdef _NEWLIB_VERSION
 void setprogname(const char *progname) __attribute__((weak));
 #endif
 
 void nacl_setprogname(char* argv0) {
 #if defined(_NEWLIB_VERSION)
   /* If setprogname exists at runtime then call it to set the program name */
   if (setprogname)
     setprogname(argv0);
 #elif defined(__GLIBC__)
   char *p = strrchr (argv0, '/');
   if (p == NULL)
     program_invocation_short_name = argv0;
   else
     program_invocation_short_name = p + 1;
   program_invocation_name = argv0;
 #endif
 }
 
+int main(int argc, char* argv[]);
+
 int cli_main(int argc, char* argv[]) {
+  _cli_main_init = true;
   if (argv && argv[0])
     nacl_setprogname(argv[0]);
 
   int rtn = nacl_setup_env();
   if (rtn != 0) {
     fprintf(stderr, "nacl_setup_env failed: %d\n", rtn);
     return 1;
   }
-  return nacl_main(argc, argv);
+
+  return main(argc, argv);
 }
 
 PPAPI_SIMPLE_REGISTER_MAIN(cli_main)