WIP SDL packages

[David Thompson]

Hello all,

Attached is a work-in-progress patch that adds SDL and SDL2 packages.

I'm having some trouble getting the dependencies sorted out. For
instance, pulseaudio is listed as an input but the configure script does
not detect pulseaudio support. Both packages build successfully, but
they are probably missing other optional dependencies.

Would anyone mind taking a look and giving some feedback?

Here is the nixpkgs definition for reference:
https://github.com/nbp/Nixpkgs/blob/master/pkgs/development/libraries/SDL/default.nix

Thanks,
- Dave

0001-gnu-Add-SDL-and-SDL2.patch
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