[Bug 19784] New: cmd doesn't handle ( ) scoping; breaks firefox build

http://bugs.winehq.org/show_bug.cgi?id=19784

           Summary: cmd doesn't handle ( ) scoping; breaks firefox build
           Product: Wine
           Version: 1.1.27
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: programs
        AssignedTo: wine-bugs(a)winehq.org
        ReportedBy: dank(a)kegel.com


bug 15359 and bug 19778 are examples of fancy syntax in firefox's
build scripts that wine's cmd doesn't handle yet.  
Here's one more example:

FOO="bar"
if "%FOO%"=="bar" (
  echo "yup"
) else (
  echo "nope"
)

On both systems, this prints "yup".  But on Wine, it goes on to print

C:\>) else (
File not found
C:\>echo "nope"
"nope"
C:\>)
File not found

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