windows: always use RtlGenRandom
on pre-1.78 Rust versions
#610
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This PR adds detection of Rust compiler version in the build script while compiling the crate for Windows targets.
If the version is smaller than 1.78, then we switch to the
windows7
backend for all Windows targets. This is necessary because on those older versions we can not disambiguate between win7 and win10 based on target triplet.Close #608