ps: display applet names in process listing

In standalone shell mode all busybox-w32 applets are displayed as
'busybox.exe' in a process listing.

I haven't found a satisfactory way to query a running instance of
busybox-w32 to determine which applet it's running.  Handle a couple
of cases:

- the process running the process scan knows its own PID and knows
  which applet it is;
- just before invoking applet_main set an environment variable whose
  name contains the PID and whose value is the current applet name.
  Children running a process scan will inherit their parent's environment
  and can therefore match the parent's PID to its applet name.

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