externals: Use SDL2 statically
Building it as a shared library causes issues distributing it to an AppImage, since linuxdeploy expects the executable to only dynamically link to system libraries. Additionally, simply dynamically linking to a library in the binary directory is bound to cause issues. Solution is to use SDL's CMake switches and build it statically. We also alias `SDL2` to `SDL2-static` on the external submodule for compatibility with the rest of the project.
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@ -47,7 +47,10 @@ target_include_directories(unicorn-headers INTERFACE ./unicorn/include)
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# SDL2
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if (NOT SDL2_FOUND AND ENABLE_SDL2)
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set(SDL_STATIC ON)
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set(SDL_SHARED OFF)
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add_subdirectory(SDL EXCLUDE_FROM_ALL)
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add_library(SDL2 ALIAS SDL2-static)
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endif()
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# SoundTouch
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