cmake FEELPP_HAS_STDIO_FMEMOPEN examples

feelpp/feelpp feelpp/cmake/modules/feelpp.dependencies.cmake :349 

CHECK_FUNCTION_EXISTS(fmemopen FEELPP_HAS_STDIO_FMEMOPEN)

feelpp/feelpp feelpp/cmake/modules/feelpp.dependencies.cmake :350 

MESSAGE(STATUS "[feelpp] FMemOpen: ${FEELPP_HAS_STDIO_FMEMOPEN}")