graphics/gdal: Revert b65451f0c18896610cde2b51274734b612e8a6f1

• Change from qhull8 to qhull
• Fix LIB_DEPENDS: change from libqhull.so to libqhull_r.so
• Bump PORTREVISION for dependency change

It would be better to update math/qhull to v8 and bump all dependent ports with
LIB_DEPENDS fix (at least libqhull.so to libqhull_r.so) at once.

PR: 261279