Continuous Integration

Fix linear sky calculation for wide sky textures #58

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Run time

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Job	Run time
MSVC x64	39m 37s
MSYS2 UCRT64	3m 32s
Linux GCC	5m 57s
macOS arm64 Clang	1m 52s
macOS x64 Clang	2m 47s
	53m 45s