HAVE_WORKING_FORK. * cli/cli-cmds.c (shell_escape): Guard call to vfork with HAVE_WORKING_VFORK and HAVE_WORKING_FORK. * remote-fileo.c (remote_fileio_mode_to_host): Accomodate lack of S_IRGRP and related macros. (remote_fileio_mode_to_target): Likewise.