stdenv/freebsd: don't inherit curl from previous stage

This was adding dependencies on the bootstrap files for longer than
necessary.

pkgs/stdenv/freebsd/default.nix

@@ -485,7 +485,6 @@ in
       # we can import the foundational libs from boot-0
       # we can import bins and libs that DON'T get imported OR LINKED into the final stdenv from boot-0
       curl = prevStage.curlReal;
-      curlReal = super.curl;
       inherit (prevStage)
         fetchurl
         python3
@@ -511,7 +510,6 @@ in
     name = "freebsd";
     overrides = prevStage: self: super: {
       __bootstrapArchive = bootstrapArchive;
-      curl = prevStage.curlReal;
       fetchurl = prevStage.fetchurlReal;
       freebsd = super.freebsd.overrideScope (
         self': super': { localesPrev = prevStage.freebsd.localesReal; }