Remove unused support for SysV shared memory

src/trusted/sel_universal/rpc_universal.cc

 /*
  * 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.
  */
 
 /*
  * NaCl testing shell
  */
 
@@ skipping 420 matching lines @@
   //                     in the handler install call.
   printf("Commands:\n");
   printf("  # <anything>\n");
   printf("    comment\n");
   printf("  show_descriptors\n");
   printf("    print the table of known descriptors (handles)\n");
   printf("  show_variables\n");
   printf("    print the table of variables and their values\n");
   printf("  set_variable <name> <value>\n");
   printf("    set variable to the given value\n");
-  printf("  sysv\n");
-  printf("    create a descriptor for an SysV shared memory (Linux only)\n");
   printf("  rpc method_name <in_args> * <out_args>\n");
   printf("    Invoke method_name.\n");
   printf("    Each in_arg is of form 'type(value)', e.g. i(42), s(\"foo\").\n");
   printf("    Each out_arg is of form 'type', e.g. i, s.\n");
   printf("  service\n");
   printf("    print the methods found by service_discovery\n");
   printf("  install_upcalls <name>\n");
   printf("    install upcalls and set variable name to the service_string\n");
   printf("  echo <args>*\n");
   printf("    print rest of line - performs variable substitution\n");
@@ skipping 222 matching lines @@
     if (!fgets(buffer, sizeof(buffer), stdin))
       break;
 
     int result = ProcessOneCommand(buffer);
     if (result == 1) break;
     if (result == -1 && abort_on_error) return false;
   }
   NaClLog(1, "exiting print eval loop\n");
   return true;
 }