[Users] Simplify Subject RegExp bug?

[Abhay S. Kushwaha]

> On Macintosh, the General properties for a folder includes the
> Simplify Subject RegExp option. On Windows the option is not
> available and adding the appropriate entries to the folderitemrc
> has no effect.

IIRC, Windows build has regexps disabled due to massive memory leaks
in the mingw regex dll.

2008-11-27 [colin]	0.2.14cvs1

  * src/attachwarner.c
  * src/claws.def
          Don't use prefs_common struct directly
          (will avoid crashes on Windows)
          Also, fix detection of text mentioning
          attachments on Windows (as regexps are
          disabled on this platform due to huge 
          leaks), by using a MatcherList with
          OR condition