Build

Blood: Fix shadows crashing when rendered in mirrors #906

Job	Run time
Windows MSYS2 x86_64 GCC	10m 24s
Windows MSYS2 i686 GCC	10m 21s
Windows MSYS2 x86_64 GCC without SDL	9m 49s
Linux GCC	4m 48s
Linux GCC SDL 1.2	4m 2s
Linux Clang	6m 18s
Linux Clang without GL	5m 19s
Linux Clang without Polymer	5m 53s
macOS Clang	3m 23s
	1h 0m 17s

Provide feedback