x11-toolkits/qt5-charts: unbreak after 020693c166d1

Project MESSAGE: perl -w /usr/local/lib/qt5/bin/syncqt.pl -module QtCharts -version 5.15.8 -outdir /wrkdirs/usr/ports/x11-toolkits/qt5-charts/work/kde-qtcharts-5.15.8p0 -builddir /wrkdirs/usr/ports/x11-toolkits/qt5-charts/work/kde-qtcharts-5.15.8p0 /wrkdirs/usr/ports/x11-toolkits/qt5-charts/work/kde-qtcharts-5.15.8p0
sh: perl: not found

PR: 266007