PID stat/status: show only the file name of processes

The Linux /proc fs shows only the file name of processes in the
`stat' and `status' files of every process directory, so adapt also
procfs to show process file names.

Add a new `args_filename` function, much similar to GNU's `basename'
but returning the original string also when the resulting file name
is an empty string.

* process.c (args_filename): New function.
(process_file_gc_stat): Wrap the `proc_stat_args' result with
`args_filename'.
(process_file_gc_status): Likewise.

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