stdenv/adapters.nix: remove static from makeStaticLibraries
stdenv/adapters.nix: remove static from makeStaticLibraries

This logic should be in the pkgs/top-level/static.nix. We don’t want
to pollute Nixpkgs with =if stdenv.static=. Also, "static" is not
descriptive. We have two types of static stdenvs, ‘makeStaticLibaries’
and ‘makeStaticBinaries’. We shouldn’t rely on a static boolean like
this.

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