Remove unused support for SysV shared memory

src/trusted/desc/desc.gyp

 # -*- python -*-
 # Copyright 2008, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 79 matching lines @@
           '-fno-strict-aliasing',
           '-Wno-missing-field-initializers'
         ],
         'xcode_settings': {
           'WARNING_CFLAGS': [
             '-fno-strict-aliasing',
             '-Wno-missing-field-initializers'
           ]
         },
         'conditions': [
-          ['OS=="linux"', {
+          ['OS=="linux" or OS=="mac"', {
             'sources': [
-              'linux/nacl_desc_sysv_shm.c',
-              'linux/nacl_desc_sysv_shm.h',
               'posix/nacl_desc.c',
             ],
           }],
           ['OS=="mac"', {
-            'sources': [
-              'posix/nacl_desc.c',
-            ],
             # Turning -pedantic off is a hack.  Without it, clang
             # complains that macro arguments are empty, which is
             # only permitted in c99 and c++0x modes.  This is true
             # even when DYNAMIC_ANNOTATIONS_ENABLED is 0 (see
             # base/third_party/dynamic_annotations/dynamic_annotations.h).
             # We really should split nacl_desc_wrapper.{cc,h} into its
             # own library to isolate the build warning relaxation to just
             # that one file.  Of course, any dependent of nacl_desc_wrapper.h
             # will also need this.
             'conditions': [
@@ skipping 130 matching lines @@
       },
       'dependencies': [
         # 'nrd_xfer',
         '<(DEPTH)/native_client/src/shared/imc/imc.gyp:imc',
         '<(DEPTH)/native_client/src/shared/platform/platform.gyp:platform',
         '<(DEPTH)/native_client/src/trusted/nacl_base/nacl_base.gyp:nacl_base',
       ],
     },
   ],
 }