[Bug 838] winedbg: Add C++ support

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=838

Bug 838 depends on bug 990, which changed state.

Bug 990 Summary: winedbg generates a lot of error messages for symbol information for cygwin dll
http://bugs.winehq.org/show_bug.cgi?id=990

What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED