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Blood: Fix shadows crashing when rendered in mirrors #923

Job	Run time
Windows MSYS2 x86_64 GCC	10m 23s
Windows MSYS2 i686 GCC	10m 5s
Windows MSYS2 x86_64 GCC without SDL	10m 5s
Linux GCC	5m 5s
Linux GCC SDL 1.2	3m 54s
Linux Clang	6m 5s
Linux Clang without GL	5m 23s
Linux Clang without Polymer	5m 49s
macOS Clang	3m 40s
	1h 0m 29s

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