devel/qt5-remoteobjects: unbreak after 020693c166d1

Project MESSAGE: perl -w /usr/local/lib/qt5/bin/syncqt.pl -module QtRepParser -version 5.15.8 -outdir /wrkdirs/usr/ports/devel/qt5-remoteobjects/work/kde-qtremoteobjects-5.15.8p0 -builddir /wrkdirs/usr/ports/devel/qt5-remoteobjects/work/kde-qtremoteobjects-5.15.8p0 /wrkdirs/usr/ports/devel/qt5-remoteobjects/work/kde-qtremoteobjects-5.15.8p0
sh: perl: not found

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