fetchzip: Use unzip from buildPackages

Additionally, the manual path manipulation becomes no longer needed.

pkgs/build-support/fetchzip/default.nix

@@ -14,7 +14,7 @@
 , name ? "source"
 , ... } @ args:
 
-lib.overrideDerivation (fetchurl ({
+(fetchurl ({
   inherit name;
 
   recursiveHash = true;
@@ -23,8 +23,6 @@ lib.overrideDerivation (fetchurl ({
 
   postFetch =
     ''
-      export PATH=${unzip}/bin:$PATH
-
       unpackDir="$TMPDIR/unpack"
       mkdir "$unpackDir"
       cd "$unpackDir"
@@ -48,6 +46,7 @@ lib.overrideDerivation (fetchurl ({
       mv "$unpackDir" "$out"
     '') #*/
     + extraPostFetch;
-} // removeAttrs args [ "stripRoot" "extraPostFetch" ]))
+} // removeAttrs args [ "stripRoot" "extraPostFetch" ])).overrideAttrs (x: {
   # Hackety-hack: we actually need unzip hooks, too
-(x: {nativeBuildInputs = x.nativeBuildInputs++ [unzip];})
+  nativeBuildInputs = x.nativeBuildInputs ++ [ unzip ];
+})