Function blake3_std::fallback::hash_many

pub fn hash_many<const N: usize>(
    inputs: &[&[u8; N]],
    key: &[u32; 8],
    counter: u64,
    increment_counter: bool,
    flags: u8,
    flags_start: u8,
    flags_end: u8,
    out: &mut [u8]
)