sdl_sound: name pkg-configfile consistent
sdl_sound: provide cmake find-script and test
Partially revert "Make build matrix output a bit nicer."

I have found a better solution.

The change to check/cross sign is not reverted.

This partially reverts commit 3797d4eb036f08b349c457fc69ae625c8534409d.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
build-matrix: use $(newline) instead of ; to enter command

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Revert "build-matrix: use $(newline) instead of ; to enter command"

This reverts commits e21b7281 and f3a7e0f2d01.

The performance penalty is not worth it. On a relatively slow box
the time spent went from 4.6s to 15s.
Merge pull request #522 from sikoragmbh/add-cmake-SDL_sound

Add cmake FindSDL_sound script
sdl_sound: Fix pkg-config name
CMake files: Add license boilerplate

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
sdl_image,sound CMakeLists: use more sensible project names

Signed-off-by: Timothy Gu <timothygu99@gmail.com>