Apply normcase to line from easy-install.pth (#3451)
Thanks for the suggestion from
https://github.com/astral-sh/uv/pull/3415#discussion_r1591772942
Also it looks like you improved `egg-link` parsing in
https://github.com/astral-sh/uv/pull/3415/commits/e23c91f52e7df1a5230fc3cb7ca6d3d4ca0b24a2
so copying the changes over to the other parse site (happy to move this
to a helper too, if so lmk where to put it)
