/usr/lib/x86_64-linux-gnu/libSDL2_image-2.0.so.0 is in libsdl2-image-2.0-0 2.0.3+dfsg1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libSDL2_image-2.0.so.0.2.1
/usr/lib/x86_64-linux-gnu/libSDL2_image-2.0.so.0.2.1