cmake HAVE_MBRTOWC examples

alibaba/AliSQL cmake/readline.cmake :44 

CHECK_FUNCTION_EXISTS(mbrtowc HAVE_MBRTOWC)

arkdb/arkproxy cmake/readline.cmake :33 

CHECK_FUNCTION_EXISTS(mbrtowc HAVE_MBRTOWC)

alibaba/AliSQLBackup cmake/readline.cmake :44 

CHECK_FUNCTION_EXISTS(mbrtowc HAVE_MBRTOWC)