Revert "Fix a compilation error #66"

This reverts commit 0eec7e74d76a56da988884700fa30b04b3a19ce2.
Update Tetengo2
Replace destructor implementation to TETENGO2_STDALT_DESTRUCTORR_DEFAULT_IMPLEMENTATION
Revert "Fix a compilation error #66"

This reverts commit 0eec7e74d76a56da988884700fa30b04b3a19ce2.
Replace destructor implementation to TETENGO2_STDALT_DESTRUCTOR_DEFAULT_IMPLEMENTATION
Merge branch 'default_function'