Remove unused support for SysV shared memory

src/trusted/service_runtime/sys_memory.c

 /*
  * Copyright (c) 2013 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.
  */
 
 #include "native_client/src/trusted/service_runtime/sys_memory.h"
 
 #include <errno.h>
 #include <string.h>
@@ skipping 385 matching lines @@
     /*
      * Preemptively refuse to map anything that's not a regular file or
      * shared memory segment.  Other types usually report st_size of zero,
      * which the code below will handle by just doing a dummy PROT_NONE
      * mapping for the requested size and never attempting the underlying
      * NaClDesc Map operation.  So without this check, the host OS never
      * gets the chance to refuse the mapping operation on an object that
      * can't do it.
      */
     if (!NACL_ABI_S_ISREG(stbuf.nacl_abi_st_mode) &&
-        !NACL_ABI_S_ISSHM(stbuf.nacl_abi_st_mode) &&
-        !NACL_ABI_S_ISSHM_SYSV(stbuf.nacl_abi_st_mode)) {
+        !NACL_ABI_S_ISSHM(stbuf.nacl_abi_st_mode)) {
       map_result = -NACL_ABI_ENODEV;
       goto cleanup;
     }
 
     /*
      * BUG(bsy): there's a race between this fstat and the actual mmap
      * below.  It's probably insoluble.  Even if we fstat again after
      * mmap and compared, the mmap could have "seen" the file with a
      * different size, after which the racing thread restored back to
      * the same value before the 2nd fstat takes place.
@@ skipping 952 matching lines @@
                         size_t                length,
                         int                   prot) {
   struct NaClApp  *nap = natp->nap;
 
   NaClLog(3, "Entered NaClSysMprotect(0x%08"NACL_PRIxPTR", "
           "0x%08"NACL_PRIxPTR", 0x%"NACL_PRIxS", 0x%x)\n",
           (uintptr_t) natp, (uintptr_t) start, length, prot);
 
   return NaClSysMprotectInternal(nap, start, length, prot);
 }