Changes since 8.17.2:

• tiffsave: fix saved resolution with a non-default resolution-unit metadata
  item [machur]
• svgload: ensure short/malformed compressed input is ignored [kleisauke,lovell]
• dzsave: Zoomify: ensure correct tile count in ImageProperties.xml [kleisauke]
• VipsSaveable: reimplement with macros to help C++ compat [jcupitt]

Windows binaries here:

https://github.com/libvips/build-win64-mxe/releases/tag/v8.17.3