sqlitebrowser: fix darwin build

pkgs/development/tools/database/sqlitebrowser/default.nix

···
-{ mkDerivation, lib, fetchFromGitHub, cmake
-, qtbase, qttools, sqlcipher, wrapGAppsHook }:
+{ lib, stdenv, mkDerivation, fetchFromGitHub, cmake
+, qtbase, qttools, sqlcipher, wrapGAppsHook, qtmacextras
+}:
 
 mkDerivation rec {
   pname = "sqlitebrowser";
···
   # but qscintilla is currently in a bit of a mess as some consumers expect a
   # -qt4 or -qt5 prefix while others do not.
   # We *really* should get that cleaned up.
-  buildInputs = [ qtbase sqlcipher ];
+  buildInputs = [ qtbase sqlcipher ] ++ lib.optionals stdenv.isDarwin [ qtmacextras ];
 
   nativeBuildInputs = [ cmake qttools wrapGAppsHook ];