libc: elf auxiliary vector handling to libsys

This is part of the interface to the kernel and some syscall wrappers
depend on it so move it there.

Reviewed by: kib, emaste, imp
Pull Request: https:

libc: elf auxiliary vector handling to libsys

This is part of the interface to the kernel and some syscall wrappers
depend on it so move it there.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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