[Cin] Some early static tar builds + today's GIT checkin

There are static tars for a lot of the Operating System distros with the latest mods in at: https://www.cinelerra-gg.org/download/testing/test_tars/ for some early testing by users. Today's checkin includes the following - with Thanks to Andrew for patches and motivation: - Build script tweaks for cross platform (a couple of days worth of testing all of the builds to prevent surprises) - lv2 tweaks/fixes (Andrew) - fix bad clamps in Color3way and Videoscope - got OpenExr upgrade to work (with Andrew help) - OpenCV upgrade and fix (patch from Andrew) - trim tarball size (the transition png's are big and RafaMar contributed new ones so had to delete some)