Function uloc_getDisplayKeyword 

pub unsafe fn uloc_getDisplayKeyword<P0, P1>(
    keyword: P0,
    displaylocale: P1,
    dest: *mut u16,
    destcapacity: i32,
    status: *mut UErrorCode,
) -> i32
where
    P0: Param<PCSTR>,
    P1: Param<PCSTR>,