Function antic::fmpz_mat_find_pivot_any

pub unsafe extern "C" fn fmpz_mat_find_pivot_any(
    mat: *mut fmpz_mat_struct, 
    start_row: mp_limb_signed_t, 
    end_row: mp_limb_signed_t, 
    c: mp_limb_signed_t
) -> mp_limb_signed_t