Add EFI_STATUS return to EMU_THUNK_PROTOCOL.SetTime()

There is an inconsistency between the UNIX and Windows
implementations of EMU_THUNK_PROTOCOL.SetTime(). The Windows
version returns an EFI_STATUS value whereas the the UNIX
implementation is VOID. However, the UNIX implementation is an
unimplemented stub whereas the Windows version is implementated.

The current EMU_THUNK_PROTOCOL function pointer definition
specifies a VOID return type. However, EMU_THUNK_PROTOCOL.SetTime()
is close to the spec defined gRT->SetTime() except for missing the
EFI_STATUS return type.

Therefore, I conclude that the most sensible reconciliation is to
add the EFI_STATUS return type to the protocol definition.

Cc: Andrew Fish <afish@apple.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com>

EmulatorPkg/Include/Protocol/EmuThunk.h

@@ -2,6 +2,7 @@
   Emulator Thunk to abstract OS services from pure EFI code
 
   Copyright (c) 2008 - 2011, Apple Inc. All rights reserved.<BR>
+  Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -153,7 +154,7 @@ VOID
   );
 
 typedef
-VOID
+EFI_STATUS
 (EFIAPI *EMU_SET_TIME)(
   IN   EFI_TIME               *Time
   );

EmulatorPkg/Unix/Host/EmuThunk.c

@@ -387,14 +387,14 @@ SecGetTime (
   }
 }
 
-VOID
+EFI_STATUS
 SecSetTime (
   IN  EFI_TIME  *Time
   )
 {
   // Don't change the time on the system
   // We could save delta to localtime() and have SecGetTime adjust return values?
-  return;
+  return EFI_UNSUPPORTED;
 }
 
 EFI_STATUS