ntoskrnl: Emulate sti/cli instructions on x86_64.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45521
Signed-off-by: Fabian Maurer <dark.shadow4@web.de>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/ntoskrnl.exe/instr.c

@@ -815,6 +815,11 @@ static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
         }
         break;  /* Unable to emulate it */
     }
+
+    case 0xfa: /* cli */
+    case 0xfb: /* sti */
+        context->Rip += prefixlen + 1;
+        return ExceptionContinueExecution;
     }
     return ExceptionContinueSearch;  /* Unable to emulate it */
 }