CryptoPkg/OpensslLib: Add native instruction support for X64

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2507

Adding OpensslLibX64.inf and modifying process_files.pl to process this
file and generate the necessary assembly files.
Adding OpensslLibX64Gcc.inf to allow building with GCC toolchain.
ApiHooks.c contains a stub function for a Windows API call.
uefi-asm.conf contains the limited assembly configurations for OpenSSL.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyux.lu@intel.com>
Cc: Mike Kinney <michael.d.kinney@intel.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Christopher Zurcher <christopher.zurcher@microsoft.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>

CryptoPkg/Library/OpensslLib/X64/ApiHooks.c

@@ -0,0 +1,22 @@
+/** @file
+  OpenSSL Library API hooks.
+
+Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+
+/**
+  Stub function for win64 API call.
+
+**/
+VOID *
+__imp_RtlVirtualUnwind (
+  VOID *    Args
+  )
+{
+  return NULL;
+}
+