math/saga: Update to 8.5.0

• Improvements to the 3D viewer
• Table calculator with better ui
• New tool Terrain Flooding
• Better handling for gdal imports
• Corrected Visibility Analysis
• New features and fixes for many tools ...

Changelog: https://sourceforge.net/p/saga-gis/wiki/Changelog%208.5.0/attachment/changelog_saga_8.5.0.txt

Reported by: portscout, Repology