[bug #61324] tmac/pdfpic.tmac: make shell pipeline called via .sy more robust

[Dave]

Update of bug #61324 (project groff):

                  Status:                    None => Duplicate              
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

Turns out bug #58206 was already open to address this.  Further discussion
should be redirected there.

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