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

ports/sqlite/nacl.patch

 diff --git a/shell.c b/shell.c
 --- a/shell.c
 +++ b/shell.c
-@@ -2935,6 +2939,10 @@ static char *cmdline_option_value(int argc, char **argv, int i){
-   return argv[i];
- }
- 
-+#ifdef PPAPI
-+#define main nacl_main
-+#endif
-+
- int main(int argc, char **argv){
-   char *zErrMsg = 0;
-   struct callback_data data;
 @@ -2952,6 +2968,10 @@ int main(int argc, char **argv){
    main_init(&data);
    stdin_is_interactive = isatty(0);
  
 +#if defined __native_client__ && !defined PPAPI
 +  stdin_is_interactive = 1;
 +#endif
 +
    /* Make sure we have a valid signal handler early, before anything
    ** else is done.
@@ skipping 34 matching lines @@
    */
    static sqlite3_vfs aVfs[] = {
 +#if defined __native_client__
 +    // Give higher priority to "unix-dotfile" over "unix", because NaCl doesn't
 +    // support some POSIX fcntl operations (F_GETLK, F_SETLK).
 +    UNIXVFS("unix-dotfile",  dotlockIoFinder ),
 +#endif
  #if SQLITE_ENABLE_LOCKING_STYLE && (OS_VXWORKS || defined(__APPLE__))
      UNIXVFS("unix",          autolockIoFinder ),
  #else