Fix software splats breaking and crashing in skyboxes
Fixes out-of-bounds memory reads in R_ClipVisSprite that cause glitches and crashes when rendering floor sprites in skyboxes or portals.
Method for reproducing the crash:
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Load this script, which puts a blue sphere floor sprite into GFZ1's skybox. sw-splat-skybox-crash.lua
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Load GFZ1.
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Go to this spot, move and look around and it should crash pretty fast. (It does on my computer at least)
Test build: (based on next so be careful with your save files)