NetworkPkg: Source fixes and cleanup for ARMGCC compiles

- Fix EFI_IPv4_ADDRESS usages to use a macro to copy the structure
   instead of direct assignment, to avoid runtime alignment errors.
- Delete excess local variables that are initialized but otherwise unused.
- Add LibraryClasses.ARM & AARCH64 section in NetworkPkg.dsc file,
   containing a CompilerIntrinsicsLib null-library, required for successful
  standalone package builds (copied from MdeModulePkg.dsc).

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Randy Pawell <randy_pawell@hp.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16472 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/TcpDxe/TcpMain.c

@@ -1,6 +1,7 @@
 /** @file
   Implementation of EFI_TCP4_PROTOCOL and EFI_TCP6_PROTOCOL.
 
+  (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
   Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
 
   This program and the accompanying materials
@@ -229,9 +230,9 @@ Tcp4Routes (
   Sock                      = SOCK_FROM_THIS (This);
 
   RouteInfo.DeleteRoute     = DeleteRoute;
-  RouteInfo.SubnetAddress   = SubnetAddress;
-  RouteInfo.SubnetMask      = SubnetMask;
-  RouteInfo.GatewayAddress  = GatewayAddress;
+  IP4_COPY_ADDRESS (&RouteInfo.SubnetAddress, &SubnetAddress);
+  IP4_COPY_ADDRESS (&RouteInfo.SubnetMask, &SubnetMask);
+  IP4_COPY_ADDRESS (&RouteInfo.GatewayAddress, &GatewayAddress);
 
   return SockRoute (Sock, &RouteInfo);
 }