Added SDL2 to package list.
Added SDL2 to package list.

JNeiger/robocup-software,JNeiger/robocup-software,RoboJackets/robocup-software,RoboJackets/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software,RoboJackets/robocup-software,RoboJackets/robocup-software