Explicitly set CXXSTD to c++11 for old C++ code using std::auto_ptr<>.

[jhb]

Summary

GCC 12 defaults to C++17 which removes (not just deprecates)
std::auto_ptr<>. Trying to use CXXSTD of c++03 doesn't work with
libc++ headers, but c++11 does.

[emaste]

Should we look at updating kyua et al to avoid using auto_ptr? (e.g. as a project idea, perhaps)

[jhb]

I looked and ran away screaming. It wasn't trivial in that you can't just do a giant s/auto_ptr/unique_ptr/. Or rather, it didn't seem like you could do it incrementally as they are all over the place. @brooks definitely has expressed a desire that Someone Else (tm) would drag kyua into the C+11 world.

[jhb]

But sure, we should list it as a project idea in case someone is up for that kind of "fun"

[imp]

In D37531#853344, @jhb wrote:

But sure, we should list it as a project idea in case someone is up for that kind of "fun"

We attract all sorts, so why not :)