CryptoPkg: Clean-up CRT Library Wrapper.

Cleaning-up CRT Library Wrapper for the third-party cryptography
library building. The changes includes
1. Rename OpenSslSupport.h to CrtLibSupport.h for future alternative
   crypto provider support.
2. Remove all un-referenced CRT APIs and headers.

(NOTE: More cleans-up could be possible after OpenSSL integrate the
      extra PR request: https://github.com/openssl/openssl/pull/2961)

Cc: Ting Ye <ting.ye@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Gary Lin <glin@suse.com>
Cc: Ronald Cron <ronald.cron@arm.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qin Long <qin.long@intel.com>
Reviewed-by: Ting Ye <ting.ye@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Gary Lin <glin@suse.com>

CryptoPkg/Library/BaseCryptLib/SysCall/ConstantTimeClock.c

@@ -12,7 +12,7 @@
   5)  DhGenerateParameter
   6)  DhGenerateKey
 
-Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2010 - 2017, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -23,7 +23,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 **/
 
-#include <OpenSslSupport.h>
+#include <CrtLibSupport.h>
 
 //
 // -- Time Management Routines --
@@ -38,4 +38,4 @@ time_t time (time_t *timer)
 struct tm * gmtime (const time_t *timer)
 {
   return NULL;
-}
+}