Function build_fcf 

pub fn build_fcf(
    frame_type: u8,
    security: bool,
    pending: bool,
    ackreq: bool,
    panid_compress: bool,
    dest_addr_mode: u8,
    frame_ver: u8,
    src_addr_mode: u8,
) -> u16

Build a Frame Control Field value from individual fields.