dtc: Sync with upstream commit 26a0fe5

[jlduran]

Summary

• 0206c0f ("Handle top-level /delete-node/ directives.")
• d612a9e ("Remove C++11 standard constrain")
• Remove extra white lines after the $FreeBSD$ tag removal

[jlduran]

• Rebase (remove FreeBSD RCSIDs).

[jlduran]

• Remove extra white lines after the $FreeBSD$ tag removal

[theraven]

LGTM.

[jlduran]

I noticed this change broke macOS cross-builds on GitHub. I guess due to the fact that man clang on macOS says: The default C++ language standard is gnu++98.

Specifying a C standard in the Makefile (CXXSTD= c++14) could do the trick, but I would prefer to set it globally or on the GitHub runner itself. Suggestions?

[emaste]

In D41482#957685, @jlduran_gmail.com wrote:

I would prefer to set it globally or on the GitHub runner itself. Suggestions?

If the default C++ standard in base system Clang / Clang 15/16 doesn't match what's in macOS Clang then I suspect we should set it in the cross-build script or actions config.