Add ssse3 implementation of __memcmp16.

__memcmp16 was missing in x86. Also added C-version for backward
compatibility. Added bionic test for __memcmp16 and for wmemcmp.

Change-Id: I33718441e7ee343cdb021d91dbeaf9ce2d4d7eb4
Signed-off-by: Alexander Ivchenko <alexander.ivchenko@intel.com>
diff --git a/libc/arch-x86/string/ssse3-wmemcmp-atom.S b/libc/arch-x86/string/ssse3-wmemcmp-atom.S
index c146b04..2c3fa02 100644
--- a/libc/arch-x86/string/ssse3-wmemcmp-atom.S
+++ b/libc/arch-x86/string/ssse3-wmemcmp-atom.S
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2011, Intel Corporation
+Copyright (c) 2011, 2012, 2013 Intel Corporation
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -29,5 +29,7 @@
 */
 
 #define MEMCMP  wmemcmp
+
+#define USE_WCHAR
 #define USE_AS_WMEMCMP 1
 #include "ssse3-memcmp-atom.S"