devel/sdl20: update to 2.0.6
graphics/mesa-libs and misc/raspberrypi-userland conflict
on <EGL/egl.h> which makes adding VIDEO_RPI non-trivial.
Changes: https://discourse.libsdl.org/t/sdl-2-0-6-released/23109
ABI: https://abi-laboratory.pro/tracker/timeline/sdl/
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