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sdl2-compat: symlink package config specification file into sdl2.pc
Previously, replacing SDL2 with sdl2-compat with dependents on the SDL2 pkgconfig file would just break.
An example for this breakage is pkgs.ffmpeg.override { SDL2 = pkgs.sdl2-compat; }.
This is fixed by symlinking the missing sdl2.pc file to point to sdl2_compat.pc.
This is analogous to #388304 (aa8bb539)