cmake HAVE_ISWUPPER examples

alibaba/AliSQL cmake/readline.cmake :50 

CHECK_FUNCTION_EXISTS(iswupper HAVE_ISWUPPER)

arkdb/arkproxy cmake/readline.cmake :36 

CHECK_FUNCTION_EXISTS(iswupper HAVE_ISWUPPER)

alibaba/AliSQLBackup cmake/readline.cmake :50 

CHECK_FUNCTION_EXISTS(iswupper HAVE_ISWUPPER)