pkgs: remove optional builtins prefixes from prelude functions

Remove optional builtins prefixes from prelude functions by running:

    builtins=(
      abort
      baseNameOf
      break
      derivation
      derivationStrict
      dirOf
      false
      fetchGit
      fetchMercurial
      fetchTarball
      fetchTree
      fromTOML
      import
      isNull
      map
      null
      placeholder
      removeAttrs
      scopedImport
      throw
      toString
      true
    )

    fd \
      --type file \
      . \
      pkgs \
      --exec-batch sed --in-place --regexp-extended "
        s/\<builtins\.($(
          printf '%s\n' "${builtins[@]}" |
            paste --delimiter '|' --serial -
        ))\>/\1/g
      "

    nix fmt

pkgs/development/interpreters/python/python2/mk-python-derivation.nix

@@ -171,12 +171,12 @@ let
       checkDrv = drv: if (isPythonModule drv) && (isMismatchedPython drv) then throwMismatch drv else drv;
 
     in
-    inputs: builtins.map (checkDrv) inputs;
+    inputs: map (checkDrv) inputs;
 
   # Keep extra attributes from `attrs`, e.g., `patchPhase', etc.
   self = toPythonModule (
     stdenv.mkDerivation (
-      (builtins.removeAttrs attrs [
+      (removeAttrs attrs [
         "disabled"
         "checkPhase"
         "checkInputs"