update libcxx, libcxxabi and libunwind to 16.0.6;

tested by and input from tb@; ok kettenis@

backport the implementation of ranges::find{, _if, _if_not}

this will be required by future chromium releases

From ee0f8c4010309a25c95115a9f727a02741e2de48 Mon Sep 17 00:00:00 2001
From: Nikolas Kl

backport the implementation of ranges::find{, _if, _if_not}

this will be required by future chromium releases

From ee0f8c4010309a25c95115a9f727a02741e2de48 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser@berlin.de>
Date: Sat, 12 Mar 2022 01:45:35 +0100
Subject: [PATCH] [libc++][ranges] Implement ranges::find{, _if, _if_not}

ok tb@

show more ...

Update build infrastructure for LLVM 13.0.0.

Update build infrastructure for libc++ and libc++abi version 11.1.0.

Switch libc++ and libc++abi to version 10.0.1.

Further libc++ header fixes for ports thanks to kettenis@
Ports build test and fixes thanks to naddy@
"Startschuss!" naddy@

Adjust link path for libc++ to find libc++abi to match change of Makefile
and build location.

Move Makefiles for libc++ and libc++abi to gnu/lib in preparation for an
upcoming update to those, which will see both codebases heading into the
gnu/llvm dumpster.

Feedback from jsg@
ok deraadt@ ke

Move Makefiles for libc++ and libc++abi to gnu/lib in preparation for an
upcoming update to those, which will see both codebases heading into the
gnu/llvm dumpster.

Feedback from jsg@
ok deraadt@ kettenis@

show more ...