ifchange.bat: drop old systems

* win32/ifchange.bat: drop support for command.com used on old
  systems.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Jun  9 15:31:09 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* win32/ifchange.bat: drop support for command.com used on old
+	  systems.
+
 Thu Jun  9 15:03:35 2016  Kazuki Yamaguchi  <k@rhe.jp>
 
 	* ext/openssl/extconf.rb: Check for CRYPTO_malloc() and SSL_new().

win32/ifchange.bat

@@ -33,34 +33,14 @@ set dest=%1
 set src=%2
 set dest=%dest:/=\%
 set src=%src:/=\%
-if not "%dest%" == "" if not "%dest%" == "%%dest:/=\%%" goto :nt
 
-if not exist %2 goto :end
-
-:: check if fc.exe works.
-echo foo > conftst1.tmp
-echo bar > conftst2.tmp
-fc.exe conftst1.tmp conftst2.tmp > nul
-if not errorlevel 1 goto :brokenfc
-del conftst1.tmp > nul
-del conftst2.tmp > nul
-
-:: target does not exist or new file differs from it.
-if not exist %1 goto :update
-fc.exe %1 %2 > nul
-if errorlevel 1 goto :update
+goto :nt
 
 :unchange
 echo %1 unchanged.
 del %2
 goto :end
 
-:brokenfc
-del conftest1.tmp > nul
-del conftest2.tmp > nul
-echo FC.EXE does not work properly.
-echo assuming %1 should be changed.
-
 :update
 echo %1 updated.
 :: if exist %1 del %1