graphics/qgis-ltr, graphics/qgis: Fix build after textproc/txt2tags update
The FreeBSD package builder complains about encoding problems after . This happens, because newer versions of textproc/txt2tags do not need the option '--encoding=utf-8' any more.
The patch is a workaround to remove such encoding entries from the QGIS port, until QGIS project changes upstream for newer txt2tags versions.
While I'm here, replace sed commands by a patch file