[CMake] Unified FindSDL module

[Carles Pagès]

Hi all,

I needed to tweak the find sdl modules to use them to cross-compile
for the Wii, so I decided to rewrite them in a unified module (used
like: find_package (SDL REQUIRED ttf gfx image net)). I'm posting it
here in case anyone finds it useful. It's not very polished, but I
tried to keep all the cases of the original modules. It works for me
at least under Linux and Windows. It uses some helper macros of a
module from the cmake wiki which can be found here:
http://zi.fi/cmake/Modules/LibFindMacros.cmake

Hope it's useful
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