C++ library update in -current

Contributed by rueda on 2025-08-22 from the ++good dept.

Rafael Sadowski (rsadowski@) completed updates to C++ libraries in -current:

CVSROOT:	/cvs
Module name:	src
Changes by:	rsadowski@cvs.openbsd.org	2025/08/21 09:26:58

Modified files:
	gnu/lib/libcxx : Makefile 
	gnu/lib/libcxx/include/c++/v1: __config_site 
	gnu/lib/libcxxabi: Makefile 
	gnu/lib/libexecinfo: Makefile 
Added files:
	gnu/lib/libcxx/include/c++/v1: __assertion_handler 

Log message:
update build infrastructure for libunwind-, libcxxabi- and libcxx-19.1.7

This gives us a modern c++ lib in base!

- gkoehler tested on powerpc64
- amd64 and aarch64 are well tested (including bulks by tb and phessler)
- armv7 by phessler
- sparc64 base + xenocara build/release went ok

As always with such a major update, it was a great achievement by the OpenBSD
team!

ok jca@ tb@

This brings the library versions in line with (base) LLVM/clang.

As usual with such major updates (library version cranks), it is recommended that those running snapshots wait a few days before updating to allow snapshots and package builds to be updated and in sync!

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