New winetricks-20080519: add synonym mfc42, show package descriptions in zenity

[Dan Kegel]

Another week, another winetricks.

Changes since last week's annoucement:

- gnome users now see nice package descriptions
- mfc42 is now listed as a synonym for vcrun6

Online as always at
  http://kegel.com/wine/winetricks
or
  http://winezeug.googlecode.com