Remove unused support for SysV shared memory

src/trusted/platform_qualify/posix/nacl_dep_qualify.c

 /*
  * Copyright (c) 2012 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.
  */
 
 /*
  * POSIX-specific routines for verifying that Data Execution Prevention is
  * functional.
  */
 
 #include <setjmp.h>
 #include <stdlib.h>
 #include <signal.h>
 
 #include "native_client/src/include/nacl_compiler_annotations.h"
 #include "native_client/src/shared/platform/nacl_check.h"
 #include "native_client/src/trusted/platform_qualify/nacl_dep_qualify.h"
-#include "native_client/src/trusted/platform_qualify/linux/sysv_shm_and_mmap.h"
 
 #if NACL_OSX
 #include <mach/mach.h>
 #endif
 
 #if (NACL_OSX && NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86 && \
      NACL_BUILD_SUBARCH == 64)
 # define EXPECTED_SIGNAL SIGBUS
 #else
 # define EXPECTED_SIGNAL SIGSEGV
@@ skipping 117 matching lines @@
 int NaClAttemptToExecuteData(void) {
   int result;
   char *thunk_buffer = malloc(64);
   if (NULL == thunk_buffer) {
     return 0;
   }
   result = NaClAttemptToExecuteDataAtAddr(thunk_buffer, 64);
   free(thunk_buffer);
   return result;
 }