`lx pack` fails on windows due to searching for incorrect filename

When running `lx pack` in a CI run, the step fails because it searches for a built library at `lib{name}.dll`, however, I believe windows does not add the `lib` prefix. I don't have a local windows machine, so this bug was found in a CI run here: https://github.com/benniekiss/minijinja-lua/actions/runs/24473845030/job/71520869117#annotation:4:99 I believe this is the related code, but I have not tested any fixes yet: https://github.com/lumen-oss/lux/blob/a411213b23a8856880cbc58140a02f9450c4bc10/lux-lib/src/lua_rockspec/build/mod.rs#L147-L150