qmonnet / rbpf / 11574889741

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feat: Reduce dependency on libc

I am attempting to reduce the dependence on libc in my indirect
dependencies. While looking at this crate I noticed some low-hanging
fruit that can be very easily replaced with libc.

- The rand() function can be re-implemented as a simple Wyrand seeded by
  the thread ID and the current time.
- libc::memcpy is used at a point where it can be replaced with
  ptr::copy_nonoverlapping.
- libc is used for memory allocation at a point where std::alloc can be
  used instead. So I use this.

I'm not too familiar with this codebase, so if any of these replacements
are incorrect, please let me know.

The only leftover libc call is mprotect().

Signed-off-by: John Nunley <dev@notgull.net>

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