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Add BETA10 macro to enable conditional compilation for BETA10 targets #5186

Job	Run time
MSVC 4.20	1m 48s
Current MSVC	2m 13s
Current msys2 mingw32	4m 8s
Current msys2 clang32	5m 10s
Download original binaries / fetch	2s
Compare with master	1m 42s
Upload artifacts	0s
	15m 3s

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