* win32/configure.bat: keep old makefile with renamed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24921 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/configure.bat

@@ -161,5 +161,8 @@ if exist pathlist.tmp echo>>~setup~.mak LIB = $(pathlist:;=/lib;)
 type>>~setup~.mak ~tmp~.mak
 del *.tmp > nul
 del ~tmp~.mak > nul
-nmake -alf ~setup~.mak
+echo>>~setup~.mak	@if exist Makefile.old del Makefile.old
+echo>>~setup~.mak	@if exist Makefile ren Makefile Makefile.old
+echo>>~setup~.mak	@ren Makefile.new Makefile
+nmake -alf ~setup~.mak MAKEFILE=Makefile.new
 :exit