cmake HAVE_ICONV_IN_LIBC examples

MapServer/MapServer cmake/FindICONV.cmake :75 

check_function_exists(iconv HAVE_ICONV_IN_LIBC)

glassechidna/zxing-cpp cmake/FindModules/FindIconv.cmake :35 

check_function_exists(iconv HAVE_ICONV_IN_LIBC)