rlimit values have different types on Linux and FreeBSD, as well as
64-bit and 32-bit platforms, so stick to the type rlim_t provided by the
libc crate.
On FreeBSD systems, the file limits are of type `i64` in comparison to
`u64` on Linux systems.
Also fix `rad web` command name on Windows and FreeBSD.
Co-authored-by: cloudhead <cloudhead@radicle.xyz>
Co-authored-by: Shawn Webb <shawn.webb@hardenedbsd.org>
Leah Neukirchen
Fintan Halpenny
cloudhead