Fix taglib detection on Windows

Reviewers: mpyne

Reviewed By: mpyne

Differential Revision: https://phabricator.kde.org/D16525
3 jobs for master in 28 minutes and 45 seconds
Status Job ID Name Coverage
  Build
passed #1650
flatpak
flatpak

00:07:29

passed #1649
freebsd
freebsd kf5-qt5 qt5.12

00:28:43

passed #1648
linux kf5-qt5 qt5.10

00:05:35

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