windows: move BCryptGenRandom to helper function #318
                
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This is not a functional change. It just makes adding additional fallback implementations easier in the future.
Note that the try_into().unwrap() is optimized away: https://godbolt.org/z/nbThsqsTE
I was originally going to try to use
BCRYPT_RNG_ALG_HANDLEand fall back to our currently implementation, but that will cause segfaults on older versions.Signed-off-by: Joe Richey [email protected]