gnulib-tool.py: Revert previous change. * pygnulib/constants.py (joinpath): Restore function and remove unused local variable. (relativize, symlink_relative, as_link_value_at_dest, hardlink): Use it. * pygnulib/GLConfig.py (resetAutoconfFile): Likewise. * pygnulib/GLEmiter.py (lib_Makefile_am, tests_Makefile_am): Likewise. * pygnulib/GLFileSystem.py (lookup, shouldLink, tmpfilename, add) (update, add_or_update, super_update): Likewise. * pygnulib/GLImport.py (__init__, relative_to_currdir) (_done_dir_, _update_ignorelist_, prepare, execute): Likewise. * pygnulib/GLInfo.py (version): Likewise. * pygnulib/GLMakefileTable.py (parent): Likewise. * pygnulib/GLModuleSystem.py (exists, find, getFiles) (getAutomakeSnippet_Unconditional): Likewise. * pygnulib/GLTestDir.py (_patch_test_driver, execute): Likewise. * pygnulib/main.py (main): Likewise.