[SDL] Const correctness for SDL video

[Patrick Mohr]

Originally my goal was to change SDL's draw functions to allow the inputted
source to be const.  I quickly found out that project would take far more
knowledge than I had, but I did manage to make all of the source rectangles
const.  I'm done with 1.2, but 1.3 isn't finished.  Can anyone think of any
problems that would be caused by making the source rectangles const?
Assuming that it does compile.

If there aren't any problems, I'm planning to do the same for 1.3.

Legal Info:
Everything in this patch in licenced under the same licenced as SDL.

PS is this the wrong place to post?
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