Build

Blood: Fix shadows crashing when rendered in mirrors #922

Job	Run time
Windows MSYS2 x86_64 GCC	10m 19s
Windows MSYS2 i686 GCC	9m 55s
Windows MSYS2 x86_64 GCC without SDL	9m 43s
Linux GCC	5m 6s
Linux GCC SDL 1.2	3m 54s
Linux Clang	6m 11s
Linux Clang without GL	5m 43s
Linux Clang without Polymer	6m 7s
macOS Clang	3m 32s
	1h 0m 30s

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