libplacebo-ubuntu-cosmic: fix installation of shaderc .so
libshaderc_shared.so is a symlink to libshaderc_shared.so.1. `install` aggressively dereferences symlinks, so it ended up installing the .so.1 to the path of .so, which worked while resolving dependencies but broke at link time - resulting in a failed job. Fix this issue by just using `cp -a` instead - the permissions are correct by default anyway.
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