Mangle import library to fix bad link with link.exe /opt:ref
Update libpng, gettext, libffi, glib, cairo
Update for OpenSlide 3.3.3
Merging with upstream, which was updated for openslide 3.3.3
Editing env var for JAVA_HOME and updated for my latest build of openslide (3.3.3.1) with Ventana TIF support