[Mesa3d-users] updated help-wanted page

[Brian P. <bri...@tu...>]

A few different development/maintence tasks have been mentioned on the 
dev list recently so I updated the "help wanted" page on the website. 
  Maybe we'll get some new contributors.

On http://www.mesa3d.org/ click on "Help Wanted" under the Developers 
Topics list.

Thanks.

-Brian