From SUSv3:     Any [standard output] field need not be meaningful in all     implementations. In such a case a hyphen ('-') should be     output in place of the field value
From SUSv3:
    Any [standard output] field need not be meaningful in all
    implementations. In such a case a hyphen ('-') should be
    output in place of the field value

So have the `-O label' option print out the string "  -" if the
process has no label.

Approved by:	Silence from rwatson and green (when asked in March...)

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