when linking libc, expose libc version in builtin import, and only call c functions in std library when linking libc whose version is known to have the function #397
Description
getRandomBytes uses getrandom from libc. This however is fairly new, requiring the 2.25 version of glibc to compiler. If not present, this will cause a link error.
https://github.com/andrewrk/tetris fails to compile for example using an older glibc 2.23.
We could just use the syscall directly which would stop this glibc requirement. A fallback to /dev/urandom would probably be good as well. Would need to check some other source for a good set of fallback procedures.