cmake HAVE_MBRTOWC examples

arkdb/inception cmake/readline.cmake :42 

CHECK_FUNCTION_EXISTS(mbrtowc HAVE_MBRTOWC)

alibaba/AliSQL cmake/readline.cmake :44 

CHECK_FUNCTION_EXISTS(mbrtowc HAVE_MBRTOWC)

Tokutek/mysql-5.5 cmake/readline.cmake :42 

CHECK_FUNCTION_EXISTS(mbrtowc HAVE_MBRTOWC)