lib/sdl: fix coding style

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sdl: remove empty SDLRectangle::destroy (we have free)

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sdl: remove unused SDLImage::partial

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sdl: do not specify extern types in sub classes

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sdl: fix implementation of SDLImage::is_ok

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: move mnit::display|input out of mnit

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sdl: move sdl out of mnit_linux

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sdl & opengles1: fix pkgconfig usage

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: adds sav for sdl, mnit_display, mnit_inputs

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>