Remove unused radiusHit values
All direct fire weapons now have 100% accuracy. This may upset game balance,
and if so, that remains to be fixed.
Fix the SDKROOT setting in sub projects.

Update xcode 4+ project files.
Update Qt to 4.8.4 for mac builds.

This commit ends support for 32 bit intel for mac builds.
Merge branch 'bugfixes'

* bugfixes:
  Update ogg to 1.3.1 for the mac build.
  Eliminate a few warnings in 3rdparty code.
  Update the xcode project file to the 3.2 format.
  Fix ups.
  Update png to 1.5.17.
  Update to glew 1.10.0 for the mac builds.