astro/stellarium: unbreak after 020693c166d1

cd /wrkdirs/usr/ports/astro/stellarium/work/.build/doc && pod2man -s 1 -r 0.22.5 -center="\ " /wrkdirs/usr/ports/astro/stellarium/work/.build/doc/stellarium.pod /wrkdirs/usr/ports/astro/stellarium/work/.build/doc/stellarium.1
/bin/sh: pod2man: not found

PR: 266007
Reported by: antoine (via exp-run)