cmake HAVE_MKOSTEMP examples

MiKTeX/miktex CMakeLists.txt :1326 

check_function_exists(mkostemp HAVE_MKOSTEMP)

fluent/fluent-bit lib/nghttp2-1.65.0/CMakeLists.txt :366 

check_function_exists(mkostemp  HAVE_MKOSTEMP)