rmdirs.bat: remove last "."

* win32/rmdirs.bat: remove last "." since rmdir fails to remove it.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49373 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: nobu

win32/rmdirs.bat

@@ -7,6 +7,7 @@ if "%1" == "" goto :end
     shift
     set dir=%dir:/=\%
     :rmdirs
+        if /%dir:~-2%/ == /\./ set dir=%dir:~0,-2%
         if not exist "%dir%\." goto :begin
         if "%dir%" == "." goto :begin
         if "%dir%" == ".." goto :begin