r=dougt a=blizzard
These are OS/2 specific porting fixes in an XP file (plevent.c)
I'm checking it in without super-review because we desperately
need these fixes in our nightly build.
git-svn-id: svn://10.0.0.236/trunk@80228 18797224-902f-48f8-a5cc-f745e15eee43