OS-5558 libmd should leverage SHA extensions

*** 19,28 ****
--- 19,29 ----
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright 2013 Saso Kiselkov. All rights reserved.
+ # Copyright (c) 2018, Joyent, Inc.
  #
  
  #
  # MAPFILE HEADER START
  #
*** 99,106 ****
--- 100,122 ----
          SHA384Init;
          SHA384Update    { FLAGS = NODYNSORT };
          SHA512Final     { FLAGS = NODYNSORT };
          SHA512Init;
          SHA512Update    { FLAGS = NODYNSORT };
+ };
+ 
+ SYMBOL_VERSION ILLUMOSprivate {
+     global:
+ $if _ELF64 && _x86
+         #
+         # We use hardware capabilities to define multiple versions of
+         # the processing certain values. Unfortunately, at this time,
+         # that requires these to be global symbols, even though we don't
+         # want them to be. As such, they remain in a private version and
+         # hopefully some day will be removed.
+         #
+         sha1_block_data_order;
+         SHA256TransformBlocks;
+ $endif
      local:
          *;
  };