[cxxmodules] Move back the stdlib library in the main libc module.
[cxxmodules] Move back the stdlib library in the main libc module.

The no_undeclared_includes attributes will not allow cycle.

olifre/root,karies/root,root-mirror/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,karies/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,olifre/root,olifre/root,karies/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,karies/root,olifre/root,root-mirror/root