`UsePoly1305Intrinsics`, `UseMD5Intrinsics` and `UseSHA1Intrinsics` depend on `!AvoidUnalignedAccesses` and thus are unavailable on platforms with slow unaligned accesses. But these options could still be enabled on the command line, which I think could be suprising to our end users as these intrinsics will only have negative impact on performance numbers for such platforms. It seems to me more reasonable to print warnings and keep them disabled when enabled by the user on such platforms.