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2021-04-18cmake: Use SDL 2.0.14 and fix CMake scope issuelat9nq1-0/+0
Forces using SDL 2.0.14. Upgrades the SDL external to that version. Adds a message when switching to the external. Fixes an error where input_common only links to SDL when SDL2_FOUND is set, but externals/CMakeLists cannot set that variable to the required scope. Switch to using ENABLE_SDL2, which we can use since we now include the SDL source.
2021-04-17externals: Add SDL 2.0.12lat9nq1-0/+0
Since Bintray is (soon to be) no more, there needs to be a way to acquire SDL2. Since 20.04's version is older than our minimum required version (2.0.12), add it as an external.