Function clipper_paths64_minkowski_diff 

pub unsafe extern "C" fn clipper_paths64_minkowski_diff(
    mem: *mut c_void,
    pattern: *mut ClipperPath64,
    paths: *mut ClipperPaths64,
    is_closed: c_int,
    fillrule: ClipperFillRule,
) -> *mut ClipperPaths64

Multi-path variant of clipper_path64_minkowski_diff; same shape as clipper_paths64_minkowski_sum.