win32/ifchange.bat: Remove code for old command.com [ci skip]

Author: nobu

win32/ifchange.bat

@@ -60,23 +60,6 @@ set src=%2
 set dest=%dest:/=\%
 set src=%src:/=\%
 
-goto :nt
-
-:unchange
-echo %1 unchanged.
-del %2
-goto :end
-
-:update
-echo %1 updated.
-:: if exist %1 del %1
-dir /b %2
-if "%keepsuffix%" != "" %1 %1%keepsuffix%
-copy %2 %1
-del %2
-goto :end
-
-:nt
 if exist %dest% (
     if not exist %src% goto :nt_unchanged1
     if "%empty%" == "" for %%I in (%src%) do if %%~zI == 0 goto :nt_unchanged