[Bug 21382] New: %~dp0 does not expand to right value

http://bugs.winehq.org/show_bug.cgi?id=21382

Summary: %~dp0 does not expand to right value
           Product: Wine
           Version: 1.1.36
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Keywords: download, source, testcase
          Severity: normal
          Priority: P2
         Component: cmd
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Create 'foo.bat' containing
  echo This batch file lives in %~dp0
When you run it, it should output the absolute
drive and directory of the directory containing
the batch file.  This seems to work ok in casual
use... but if you put the batch file into, say,
C:\foobar\foo.bat
and do 
$ wine cmd
c:> PATH %PATH%;c:\foobar
c:> foo
you will see the name of the current directory, not the expected c:\foobar.

This breaks lots of batch files, including
http://src.chromium.org/svn/trunk/tools/depot_tools/gclient.bat
which normally are run via PATH by developers who work from the
commandline.