[curl] Build with libpsl

[kylewlacy]

For context, see #185

During the upgrade to Curl 8.11.1, jaudiger added --without-libpsl to the Curl build to resolve a build failure (in line with what NixOS / Homebrew are doing)

But it might be worthwhile to enable libpsl during the Curl build: the Curl docs give context that it's used for handling cookies (see https://everything.curl.dev/build/deps.html#libpsl). This would most likely mean adding a new libpsl package that we could link against.

[jaudiger]

I'll work on it.