libxml++ 2.40.0
libxml++ 2.40.0

needs C++11 now, and so will all other C++ gnome projects!

Closes #44204.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

kwilczynski/homebrew,kwilczynski/homebrew,kwilczynski/homebrew,kwilczynski/homebrew