Function uikit_sys::CFURLCreateStringByAddingPercentEscapes

pub unsafe extern "C" fn CFURLCreateStringByAddingPercentEscapes(
    allocator: CFAllocatorRef, 
    originalString: CFStringRef, 
    charactersToLeaveUnescaped: CFStringRef, 
    legalURLCharactersToBeEscaped: CFStringRef, 
    encoding: CFStringEncoding
) -> CFStringRef