OS report these are "horizontal scrollwheel" events, which confuses gaming
 apps in several legitimate conditions. Now all scrollwheel events are made
 to look vertical when passed to the app.

Patch by John Knottenbelt.

 http://www.libsdl.org/pipermail/sdl/2005-March/067978.html

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401051