EmulatorPkg/Win: Add Windows host support

This is the initial patch to make it boot to early DXE
phase without display (only debug message).

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
Cc: Andrew Fish <afish@apple.com>

EmulatorPkg/EmulatorPkg.dsc

@@ -251,6 +251,13 @@
   EmulatorPkg/Unix/Host/Host.inf
 !endif
 
+!ifdef $(WIN_SEC_BUILD)
+  ##
+  #  Emulator, OS WIN application
+  ##
+  EmulatorPkg/Win/Host/WinHost.inf
+!endif
+
 !ifndef $(SKIP_MAIN_BUILD)
   #
   # Generic SEC