* demangle.c (demangling_style_names): New variable.
(_initialize_demangler): Fill demangling_style_names with the
names of known demangling styles from libiberty_demanglers[]. Use
add_set_enum_cmd instead of add_set_cmd, to get completion on
demangling style names.
* proc-api.c (_initialize_proc_api): Make `procfs-file' use
file-name completion.
* remote-rdi.c (_initialize_remote_rdi): Ditto for `rdilogfile'.
* solib.c (_initialize_solib): Ditto for `solib-search-path' and
`solib-absolute-prefix'.
* tracepoint.c (_initialize_tracepoint): Ditto for
`save-tracepoints'.
* win32-nat.c (_initialize_inftarg): Ditto for `dll-symbols'.
* cli/cli-cmds.c (init_cli_cmds): Make `shell' and `make' use
file-name completion.
* infcmd.c (_initialize_infcmd): Make the following commands use
the file-name completer: `tty', `args', `path', `paths', and
`run'.