Edk2: Remove nt32 related flag in bat files

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1693

NT32Pkg has been removed, remove nt32 related
flags in bat files.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/toolsetup.bat

@@ -26,14 +26,6 @@ if /I "%1"=="/?" goto Usage
 
 :loop
   if "%1"=="" goto setup_workspace
-  if /I "%1"=="--nt32" (
-    if /I "%2" == "X64" (
-      shift
-    )
-    @REM Ignore --nt32 flag
-    shift
-    goto loop
-  )
   if /I "%1"=="Reconfig" (
     shift
     set RECONFIG=TRUE