Function TCOD_heightmap_add_fbm 

pub unsafe extern "C" fn TCOD_heightmap_add_fbm(
    hm: *mut TCOD_heightmap_t,
    noise: TCOD_noise_t,
    mulx: f32,
    muly: f32,
    addx: f32,
    addy: f32,
    octaves: f32,
    delta: f32,
    scale: f32,
)