cmake HAVE_ATEXIT examples

Unidata/netcdf-c CMakeLists.txt :1339 

CHECK_FUNCTION_EXISTS(atexit HAVE_ATEXIT)

gridlab-d/gridlab-d cmake/CheckDependencies.cmake :48 

CHECK_FUNCTION_EXISTS(atexit HAVE_ATEXIT)

gccxml/gccxml GCC/config_cmake/CMakeLists.txt :206 

CHECK_FUNCTION_EXISTS(atexit HAVE_ATEXIT)