devel/libcutl: fix build on current by restricting to c++11

In file included from shared-ptr/base.cxx:5:
../cutl/shared-ptr/base.hxx:34:41: error: ISO C++17 does not allow
dynamic exception specifications [-Wdynamic-exception-spec] operator new
(std::size_t, cutl::share) throw (std::bad_alloc);
^~~~~~~~~~~~~~~~~~~~~~
../cutl/shared-ptr/base.hxx:34:41: note: use 'noexcept(false)' instead